Refactor event handling and improve argument validation across indicators

- Updated event handler signatures to use TValueEventArgs for consistency in Mama, Mgdi, Pwma, Rma, Sma, Ssf, Super, T3, Tema, Trima, Usf, Vidya, Wma, and Atr classes.
- Enhanced argument validation by specifying parameter names in exceptions for clarity.
- Adjusted tests to align with new event handler signatures.
- Improved code readability and maintainability by using structured records and lambda expressions.

.github/prepare-qodana.sh

@@ -9,3 +9,6 @@ echo "Modifying csproj files to target only net8.0 for Qodana..."
 find . -name "*.csproj" -exec sed -i 's|<TargetFrameworks>net10.0;net8.0</TargetFrameworks>|<TargetFramework>net8.0</TargetFramework>|g' {} +
 # Just in case some files still have single target net10.0
 find . -name "*.csproj" -exec sed -i 's|<TargetFramework>net10.0</TargetFramework>|<TargetFramework>net8.0</TargetFramework>|g' {} +
+
+echo "Restoring NuGet packages in container..."
+dotnet restore --no-cache

.vscode/settings.json

@@ -113,11 +113,16 @@
   "git.decorations.enabled": true,
 
   // ?????????????????????????????????????????????????????????????????
-  // Terminal Settings (Preserved from original)
+  // Terminal Settings - WSL Debian
   // ?????????????????????????????????????????????????????????????????
   
-  "terminal.integrated.defaultProfile.windows": "PowerShell",
+  "terminal.integrated.defaultProfile.windows": "Debian",
   "terminal.integrated.profiles.windows": {
+    "Debian": {
+      "path": "C:\\Windows\\System32\\wsl.exe",
+      "args": ["-d", "Debian", "--", "bash", "-l"],
+      "icon": "terminal-linux"
+    },
     "PowerShell": {
       "source": "PowerShell",
       "icon": "terminal-powershell"
@@ -126,6 +131,13 @@
   "terminal.integrated.shellIntegration.enabled": true,
   "terminal.integrated.suggest.enabled": true,
 
+  // ?????????????????????????????????????????????????????????????????
+  // Cline Settings - WSL Debian Bash
+  // ?????????????????????????????????????????????????????????????????
+  
+  "cline.terminalShell.windows": "C:\\Windows\\System32\\wsl.exe",
+  "cline.terminalShellArgs.windows": ["-d", "Debian", "--", "bash", "-l"],
+
   // ?????????????????????????????????????????????????????????????????
   // File Exclusions (Reduce Noise)
   // ?????????????????????????????????????????????????????????????????

Directory.Build.props

@@ -22,6 +22,12 @@
     <IsLocalBuild Condition="'$(GITHUB_ACTIONS)' == ''">true</IsLocalBuild>
   </PropertyGroup>
 
+  <PropertyGroup>
+    <EnableNETAnalyzers>true</EnableNETAnalyzers>
+    <EnforceCodeStyleInBuild>true</EnforceCodeStyleInBuild>
+    <TreatWarningsAsErrors Condition="'$(Configuration)' == 'Release'">true</TreatWarningsAsErrors>
+  </PropertyGroup>
+
   <PropertyGroup Condition="'$(Configuration)' == 'Release'">
     <PublishTrimmed>true</PublishTrimmed>
     <TrimMode>link</TrimMode>
@@ -45,7 +51,7 @@
   </PropertyGroup>
 
   <PropertyGroup>
-    <NoWarn>$(NoWarn);S1144;S1944;S2053;S2222;S2245;S2259;S2583;S2589;S3329;S3655;S3776;S3900;S3949;S3966;S4158;S4347;S5773;S6781</NoWarn>
+    <NoWarn>$(NoWarn);S1144;S1944;S2053;S2222;S2245;S2259;S2583;S2589;S3329;S3655;S3776;S3900;S3949;S3966;S4158;S4347;S5773;S6781;MA0048;MA0051</NoWarn>
   </PropertyGroup>
 
   <ItemGroup>

lib/core/AbstractBase.cs

@@ -31,14 +31,14 @@ public abstract class AbstractBase : ITValuePublisher
     /// <summary>
     /// Event triggered when a new TValue is available.
     /// </summary>
-    public event Action<TValue>? Pub;
+    public event TValuePublishedHandler? Pub;
 
     /// <summary>
     /// Helper to invoke the Pub event.
     /// </summary>
-    protected void PubEvent(TValue value)
+    protected void PubEvent(TValue value, bool isNew = true)
     {
-        Pub?.Invoke(value);
+        Pub?.Invoke(this, new TValueEventArgs { Value = value, IsNew = isNew });
     }
 
     /// <summary>

lib/core/simd/SimdExtensions.cs

@@ -395,7 +395,7 @@ public static class SimdExtensions
     public static void Add(ReadOnlySpan<double> left, ReadOnlySpan<double> right, Span<double> result)
     {
         if (left.Length != right.Length || left.Length != result.Length)
-            throw new ArgumentException("All spans must have the same length");
+            throw new ArgumentException("All spans must have the same length", nameof(result));
 
         int i = 0;
         if (Vector.IsHardwareAccelerated && left.Length >= Vector<double>.Count)
@@ -423,7 +423,7 @@ public static class SimdExtensions
     public static void Subtract(ReadOnlySpan<double> left, ReadOnlySpan<double> right, Span<double> result)
     {
         if (left.Length != right.Length || left.Length != result.Length)
-            throw new ArgumentException("All spans must have the same length");
+            throw new ArgumentException("All spans must have the same length", nameof(result));
 
         int i = 0;
         if (Vector.IsHardwareAccelerated && left.Length >= Vector<double>.Count)
@@ -451,7 +451,7 @@ public static class SimdExtensions
     public static double DotProduct(this ReadOnlySpan<double> a, ReadOnlySpan<double> b)
     {
         if (a.Length != b.Length)
-            throw new ArgumentException("Spans must have equal length");
+            throw new ArgumentException("Spans must have equal length", nameof(b));
 
         if (a.IsEmpty) return 0.0;
 

lib/core/tbar/tbar.cs

@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 
 namespace QuanTAlib;
 
@@ -7,6 +8,7 @@ namespace QuanTAlib;
 /// Pure data type: 48 bytes (long + 5 doubles).
 /// </summary>
 [SkipLocalsInit]
+[StructLayout(LayoutKind.Auto)]
 public readonly record struct TBar(long Time, double Open, double High, double Low, double Close, double Volume)
 {
     public DateTime AsDateTime => new(Time, DateTimeKind.Utc);

lib/core/tbarseries/TBarSeries.Tests.cs

@@ -358,8 +358,8 @@ namespace QuanTAlib.Tests
         {
             var series = new TBarSeries();
             TBar? received = null;
-            series.Pub += bar => received = bar;
-            
+            series.Pub += (object? sender, in TBarEventArgs args) => received = args.Value;
+
             var barToAdd = new TBar(100, 10, 15, 5, 12, 100);
             series.Add(barToAdd, isNew: true);
             
@@ -374,8 +374,8 @@ namespace QuanTAlib.Tests
             var series = new TBarSeries();
             TBar? received = null;
             series.Add(100, 10, 15, 5, 12, 100);
-            series.Pub += bar => received = bar;
-            
+            series.Pub += (object? sender, in TBarEventArgs args) => received = args.Value;
+
             series.Add(100, 10, 18, 5, 15, 150, isNew: false);
             
             Assert.NotNull(received);

lib/core/tbarseries/tbarseries.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Collections;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
@@ -9,17 +10,32 @@ namespace QuanTAlib;
 /// Stores Time, Open, High, Low, Close, Volume in separate contiguous arrays for SIMD efficiency.
 /// Exposes TSeries views for each component that share the underlying Time array.
 /// </summary>
+[StructLayout(LayoutKind.Auto)]
+public readonly struct TBarEventArgs
+{
+    public TBar Value { get; init; }
+    public bool IsNew { get; init; }
+}
+
+// Performance-focused event args struct; not derived from EventArgs by design.
+// We intentionally deviate from the standard EventArgs pattern here for perf.
+#pragma warning disable MA0046 // The second parameter must be of type 'System.EventArgs' or a derived type
+public delegate void TBarPublishedHandler(object? sender, in TBarEventArgs args);
+#pragma warning restore MA0046
+
 public class TBarSeries : IReadOnlyList<TBar>
 {
+#pragma warning disable MA0016 // Prefer using collection abstraction instead of implementation
     protected readonly List<long> _t;
     protected readonly List<double> _o;
     protected readonly List<double> _h;
     protected readonly List<double> _l;
     protected readonly List<double> _c;
     protected readonly List<double> _v;
+#pragma warning restore MA0016
 
     public string Name { get; set; } = "Bar";
-    public event Action<TBar>? Pub;
+    public event TBarPublishedHandler? Pub;
 
     // Note: These views share underlying storage. Do not modify directly; use TBarSeries.Add() instead.
     public TSeries Open { get; }
@@ -102,7 +118,7 @@ public class TBarSeries : IReadOnlyList<TBar>
             _v[lastIdx] = bar.Volume;
         }
 
-        Pub?.Invoke(bar);
+        Pub?.Invoke(this, new TBarEventArgs { Value = bar, IsNew = isNew });
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -126,7 +142,7 @@ public class TBarSeries : IReadOnlyList<TBar>
             hArr.Length != lArr.Length || lArr.Length != cArr.Length ||
             cArr.Length != vArr.Length)
         {
-            throw new ArgumentException("All arrays must have the same length");
+            throw new ArgumentException("All arrays must have the same length", nameof(t));
         }
 
         for (int i = 0; i < tArr.Length; i++)

lib/core/tseries/ITValuePublisher.cs

@@ -2,6 +2,14 @@ using System;
 
 namespace QuanTAlib;
 
+public sealed class TValueEventArgs : EventArgs
+{
+    public TValue Value { get; init; }
+    public bool IsNew { get; init; }
+}
+
+public delegate void TValuePublishedHandler(object? sender, TValueEventArgs args);
+
 /// <summary>
 /// Interface for objects that publish TValue updates.
 /// </summary>
@@ -10,5 +18,5 @@ public interface ITValuePublisher
     /// <summary>
     /// Event triggered when a new TValue is available.
     /// </summary>
-    event Action<TValue> Pub;
+    event TValuePublishedHandler? Pub;
 }

lib/core/tseries/TSeries.Tests.cs

@@ -298,7 +298,7 @@ public class TSeriesTests
         {
             var series = new TSeries();
             TValue? received = null;
-            series.Pub += tv => received = tv;
+            series.Pub += (object? sender, TValueEventArgs args) => received = args.Value;
 
             series.Add(100, 42.0);
 
@@ -313,7 +313,7 @@ public class TSeriesTests
             var series = new TSeries();
             TValue? received = null;
             series.Add(100, 42.0);
-            series.Pub += tv => received = tv;
+            series.Pub += (object? sender, TValueEventArgs args) => received = args.Value;
 
             series.Add(100, 43.0, isNew: false);
 

lib/core/tseries/tseries.cs

@@ -13,12 +13,14 @@ namespace QuanTAlib;
 /// </summary>
 public class TSeries : IReadOnlyList<TValue>, ITValuePublisher
 {
+#pragma warning disable MA0016 // Prefer using collection abstraction instead of implementation
     protected readonly List<long> _t;
     protected readonly List<double> _v;
+#pragma warning restore MA0016
 
     public string Name { get; set; } = "Data";
 
-    public event Action<TValue>? Pub;
+    public event TValuePublishedHandler? Pub;
 
     public TSeries() : this(0)
     {
@@ -30,10 +32,18 @@ public class TSeries : IReadOnlyList<TValue>, ITValuePublisher
         _v = new List<double>(capacity);
     }
 
-    public TSeries(List<long> time, List<double> values)
+    public TSeries(IReadOnlyList<long> time, IReadOnlyList<double> values)
     {
-        _t = time;
-        _v = values;
+        if (time is List<long> timeList && values is List<double> valueList)
+        {
+            _t = timeList;
+            _v = valueList;
+        }
+        else
+        {
+            _t = new List<long>(time);
+            _v = new List<double>(values);
+        }
     }
 
     public int Count
@@ -98,7 +108,9 @@ public class TSeries : IReadOnlyList<TValue>, ITValuePublisher
             _t[lastIdx] = value.Time;
             _v[lastIdx] = value.Value;
         }
-        Pub?.Invoke(value);
+
+        var args = new TValueEventArgs { Value = value, IsNew = isNew };
+        Pub?.Invoke(this, args);
     }
 
     // Overload for backward compatibility (assumes isNew=true)

lib/core/tvalue/tvalue.cs

@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 
 namespace QuanTAlib;
 
@@ -7,6 +8,7 @@ namespace QuanTAlib;
 /// Pure data type: 16 bytes (long + double).
 /// </summary>
 [SkipLocalsInit]
+[StructLayout(LayoutKind.Auto)]
 public readonly record struct TValue(long Time, double Value)
 {
     public DateTime AsDateTime => new(Time, DateTimeKind.Utc);

lib/feeds/gbm/ValidationHelper.cs

@@ -13,7 +13,7 @@ public static class ValidationHelper
     public const double TulipTolerance = 1e-7;
     public const double RelativeTolerance = 0.005;
 
-    public static void VerifyData<TResult>(TSeries qSeries, List<TResult> sSeries, Func<TResult, double?> selector, int skip = 100, double tolerance = DefaultTolerance)
+    public static void VerifyData<TResult>(TSeries qSeries, IReadOnlyList<TResult> sSeries, Func<TResult, double?> selector, int skip = 100, double tolerance = DefaultTolerance)
     {
         Assert.Equal(qSeries.Count, sSeries.Count);
 
@@ -31,7 +31,7 @@ public static class ValidationHelper
         }
     }
 
-    public static void VerifyData<TResult>(List<double> qResults, List<TResult> sSeries, Func<TResult, double?> selector, int skip = 100, double tolerance = DefaultTolerance)
+    public static void VerifyData<TResult>(IReadOnlyList<double> qResults, IReadOnlyList<TResult> sSeries, Func<TResult, double?> selector, int skip = 100, double tolerance = DefaultTolerance)
     {
         Assert.Equal(qResults.Count, sSeries.Count);
 
@@ -87,7 +87,7 @@ public static class ValidationHelper
         }
     }
 
-    public static void VerifyData(List<double> qResults, double[] tOutput, int lookback, int skip = 100, double tolerance = DefaultTolerance)
+    public static void VerifyData(IReadOnlyList<double> qResults, double[] tOutput, int lookback, int skip = 100, double tolerance = DefaultTolerance)
     {
         int count = qResults.Count;
         int start = Math.Max(0, count - skip);
@@ -148,7 +148,7 @@ public static class ValidationHelper
         }
     }
 
-    public static void VerifyData(List<double> qResults, double[] tOutput, Range outRange, int lookback, int skip = 100, double tolerance = DefaultTolerance)
+    public static void VerifyData(IReadOnlyList<double> qResults, double[] tOutput, Range outRange, int lookback, int skip = 100, double tolerance = DefaultTolerance)
     {
         int count = qResults.Count;
         int start = Math.Max(0, count - skip);

lib/momentum/adx/Adx.cs

@@ -57,7 +57,7 @@ public sealed class Adx : ITValuePublisher
     /// </summary>
     public string Name { get; }
 
-    public event Action<TValue>? Pub;
+    public event TValuePublishedHandler? Pub;
 
     /// <summary>
     /// Current ADX value.
@@ -265,7 +265,7 @@ public sealed class Adx : ITValuePublisher
         DiMinus = new TValue(input.Time, diMinus);
         Last = new TValue(input.Time, _adx);
 
-        Pub?.Invoke(Last);
+        Pub?.Invoke(this, new TValueEventArgs { Value = Last, IsNew = isNew });
         return Last;
     }
 

lib/momentum/adxr/Adxr.cs

@@ -30,7 +30,7 @@ public sealed class Adxr : ITValuePublisher
     /// </summary>
     public string Name { get; }
 
-    public event Action<TValue>? Pub;
+    public event TValuePublishedHandler? Pub;
 
     /// <summary>
     /// Current ADXR value.
@@ -130,7 +130,7 @@ public sealed class Adxr : ITValuePublisher
         }
 
         Last = new TValue(input.Time, adxr);
-        Pub?.Invoke(Last);
+        Pub?.Invoke(this, new TValueEventArgs { Value = Last, IsNew = true });
         return Last;
     }
 
@@ -233,3 +233,4 @@ public sealed class Adxr : ITValuePublisher
         return new TSeries(tList, [.. v]);
     }
 }
+

lib/momentum/ao/Ao.cs

@@ -31,7 +31,7 @@ public sealed class Ao : ITValuePublisher
     /// </summary>
     public string Name { get; }
 
-    public event Action<TValue>? Pub;
+    public event TValuePublishedHandler? Pub;
 
     /// <summary>
     /// Current AO value.
@@ -99,7 +99,7 @@ public sealed class Ao : ITValuePublisher
 
         double ao = sFast.Value - sSlow.Value;
         Last = new TValue(input.Time, ao);
-        Pub?.Invoke(Last);
+        Pub?.Invoke(this, new TValueEventArgs { Value = Last, IsNew = true });
         return Last;
     }
 
@@ -117,7 +117,7 @@ public sealed class Ao : ITValuePublisher
 
         double ao = sFast.Value - sSlow.Value;
         Last = new TValue(input.Time, ao);
-        Pub?.Invoke(Last);
+        Pub?.Invoke(this, new TValueEventArgs { Value = Last, IsNew = true });
         return Last;
     }
 
@@ -167,7 +167,7 @@ public sealed class Ao : ITValuePublisher
     public static void Calculate(ReadOnlySpan<double> high, ReadOnlySpan<double> low, Span<double> destination, int fastPeriod = 5, int slowPeriod = 34)
     {
         if (high.Length != low.Length || high.Length != destination.Length)
-            throw new ArgumentException("High, low, and destination spans must have the same length.");
+            throw new ArgumentException("High, low, and destination spans must have the same length.", nameof(destination));
 
         int len = high.Length;
         if (len == 0) return;

lib/momentum/apo/Apo.cs

@@ -26,13 +26,14 @@ public sealed class Apo : ITValuePublisher
 {
     private readonly Ema _emaFast;
     private readonly Ema _emaSlow;
+    private readonly TValuePublishedHandler _handler;
 
     /// <summary>
     /// Display name for the indicator.
     /// </summary>
     public string Name { get; }
 
-    public event Action<TValue>? Pub;
+    public event TValuePublishedHandler? Pub;
 
     /// <summary>
     /// Current APO value.
@@ -65,6 +66,7 @@ public sealed class Apo : ITValuePublisher
 
         _emaFast = new Ema(fastPeriod);
         _emaSlow = new Ema(slowPeriod);
+        _handler = Handle;
         WarmupPeriod = slowPeriod;
         Name = $"Apo({fastPeriod},{slowPeriod})";
     }
@@ -77,7 +79,7 @@ public sealed class Apo : ITValuePublisher
     /// <param name="slowPeriod">Slow EMA period (default 26)</param>
     public Apo(ITValuePublisher source, int fastPeriod = 12, int slowPeriod = 26) : this(fastPeriod, slowPeriod)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
     /// <summary>
@@ -105,7 +107,7 @@ public sealed class Apo : ITValuePublisher
 
         double apo = eFast.Value - eSlow.Value;
         Last = new TValue(input.Time, apo);
-        Pub?.Invoke(Last);
+        Pub?.Invoke(this, new TValueEventArgs { Value = Last, IsNew = isNew });
         return Last;
     }
 
@@ -143,6 +145,11 @@ public sealed class Apo : ITValuePublisher
         return new TSeries(t, v);
     }
 
+    private void Handle(object? sender, TValueEventArgs args)
+    {
+        Update(args.Value, args.IsNew);
+    }
+
     /// <summary>
     /// Calculates APO for the entire series using a new instance.
     /// </summary>
@@ -167,7 +174,7 @@ public sealed class Apo : ITValuePublisher
     public static void Calculate(ReadOnlySpan<double> source, Span<double> output, int fastPeriod = 12, int slowPeriod = 26)
     {
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output spans must be of the same length.");
+            throw new ArgumentException("Source and output spans must be of the same length.", nameof(output));
 
         Span<double> fastEma = source.Length <= 1024 ? stackalloc double[source.Length] : new double[source.Length];
         Span<double> slowEma = source.Length <= 1024 ? stackalloc double[source.Length] : new double[source.Length];

lib/momentum/aroon/Aroon.cs

@@ -32,7 +32,7 @@ public sealed class Aroon : ITValuePublisher
     /// </summary>
     public string Name { get; }
 
-    public event Action<TValue>? Pub;
+    public event TValuePublishedHandler? Pub;
 
     /// <summary>
     /// Current Aroon Oscillator value (Up - Down).
@@ -150,7 +150,7 @@ public sealed class Aroon : ITValuePublisher
         Down = new TValue(input.Time, down);
         Last = new TValue(input.Time, osc);
 
-        Pub?.Invoke(Last);
+        Pub?.Invoke(this, new TValueEventArgs { Value = Last, IsNew = true });
         return Last;
     }
 
@@ -255,3 +255,4 @@ public sealed class Aroon : ITValuePublisher
         return new TSeries(tList, [.. v]);
     }
 }
+

lib/momentum/aroonosc/AroonOsc.cs

@@ -32,7 +32,7 @@ public sealed class AroonOsc : ITValuePublisher
     /// </summary>
     public string Name { get; }
 
-    public event Action<TValue>? Pub;
+    public event TValuePublishedHandler? Pub;
 
     /// <summary>
     /// Current Aroon Oscillator value.
@@ -136,7 +136,7 @@ public sealed class AroonOsc : ITValuePublisher
 
         Last = new TValue(input.Time, osc);
 
-        Pub?.Invoke(Last);
+        Pub?.Invoke(this, new TValueEventArgs { Value = Last, IsNew = true });
         return Last;
     }
 
@@ -241,3 +241,4 @@ public sealed class AroonOsc : ITValuePublisher
         return new TSeries(tList, [.. v]);
     }
 }
+

lib/momentum/bop/Bop.cs

@@ -32,7 +32,7 @@ public sealed class Bop : ITValuePublisher
     /// </summary>
     public static string Name => "Bop";
 
-    public event Action<TValue>? Pub;
+    public event TValuePublishedHandler? Pub;
 
     /// <summary>
     /// Current BOP value.
@@ -76,7 +76,7 @@ public sealed class Bop : ITValuePublisher
         }
 
         Last = new TValue(input.Time, bop);
-        Pub?.Invoke(Last);
+        Pub?.Invoke(this, new TValueEventArgs { Value = Last, IsNew = true });
         return Last;
     }
 
@@ -92,7 +92,7 @@ public sealed class Bop : ITValuePublisher
         // Or we could throw NotSupportedException.
         // Given the interface contract, returning 0 is safer than crashing.
         Last = new TValue(input.Time, 0);
-        Pub?.Invoke(Last);
+        Pub?.Invoke(this, new TValueEventArgs { Value = Last, IsNew = true });
         return Last;
     }
 
@@ -180,3 +180,4 @@ public sealed class Bop : ITValuePublisher
         return new TSeries(t, v);
     }
 }
+

lib/momentum/cfb/Cfb.cs

@@ -37,12 +37,14 @@ public sealed class Cfb : ITValuePublisher
     private readonly double[] _runningSums;
     private readonly double[] _p_runningSums;
 
+    [StructLayout(LayoutKind.Auto)]
     private record struct State(double PrevCfb, double LastPrice, double LastValidValue);
     private State _state;
     private State _p_state;
+    private readonly TValuePublishedHandler _handler;
 
     public string Name { get; }
-    public event Action<TValue>? Pub;
+    public event TValuePublishedHandler? Pub;
     public TValue Last { get; private set; }
     public bool IsHot => _prices.IsFull;
     public int WarmupPeriod { get; }
@@ -81,14 +83,18 @@ public sealed class Cfb : ITValuePublisher
         _p_runningSums = new double[_lengths.Length];
 
         Name = "Jurik Composite Fractal Behavior";
+        _handler = Handle;
         _state.PrevCfb = 1.0;
     }
 
     public Cfb(ITValuePublisher source, int[]? lengths = null) : this(lengths)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private void Handle(object? sender, TValueEventArgs args) => Update(args.Value, args.IsNew);
+
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public void Reset()
     {
@@ -210,7 +216,7 @@ public sealed class Cfb : ITValuePublisher
         _state.PrevCfb = cfb;
 
         Last = new TValue(input.Time, cfb);
-        Pub?.Invoke(Last);
+        Pub?.Invoke(this, new TValueEventArgs { Value = Last, IsNew = isNew });
         return Last;
     }
 

lib/momentum/dmx/Dmx.cs

@@ -23,7 +23,7 @@ public sealed class Dmx : ITValuePublisher
     private bool _isInitialized;
 
     public string Name { get; }
-    public event Action<TValue>? Pub;
+    public event TValuePublishedHandler? Pub;
     public TValue Last { get; private set; }
     public int WarmupPeriod { get; }
 
@@ -114,7 +114,7 @@ public sealed class Dmx : ITValuePublisher
         double dmxValue = diPlus - diMinus;
 
         Last = new TValue(input.Time, dmxValue);
-        Pub?.Invoke(Last);
+        Pub?.Invoke(this, new TValueEventArgs { Value = Last, IsNew = true });
         return Last;
     }
 
@@ -159,7 +159,7 @@ public sealed class Dmx : ITValuePublisher
             return;
 
         if (low.Length != len || close.Length != len || destination.Length != len)
-            throw new ArgumentException("All input spans must have the same length");
+            throw new ArgumentException("All input spans must have the same length", nameof(destination));
 
         if (period <= 0)
             throw new ArgumentException("Period must be greater than zero.", nameof(period));

lib/momentum/macd/Macd.cs

@@ -23,6 +23,7 @@ public sealed class Macd : ITValuePublisher
     private readonly Ema _fastEma;
     private readonly Ema _slowEma;
     private readonly Ema _signalEma;
+    private readonly TValuePublishedHandler _handler;
 
     public string Name { get; }
     public bool IsHot => _fastEma.IsHot && _slowEma.IsHot && _signalEma.IsHot;
@@ -32,13 +33,14 @@ public sealed class Macd : ITValuePublisher
     public TValue Signal { get; private set; }
     public TValue Histogram { get; private set; }
 
-    public event Action<TValue>? Pub;
+    public event TValuePublishedHandler? Pub;
 
     public Macd(int fastPeriod = 12, int slowPeriod = 26, int signalPeriod = 9)
     {
         _fastEma = new Ema(fastPeriod);
         _slowEma = new Ema(slowPeriod);
         _signalEma = new Ema(signalPeriod);
+        _handler = Handle;
         
         Name = $"Macd({fastPeriod},{slowPeriod},{signalPeriod})";
         WarmupPeriod = Math.Max(fastPeriod, slowPeriod) + signalPeriod;
@@ -47,7 +49,7 @@ public sealed class Macd : ITValuePublisher
     public Macd(ITValuePublisher source, int fastPeriod = 12, int slowPeriod = 26, int signalPeriod = 9) 
         : this(fastPeriod, slowPeriod, signalPeriod)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -78,7 +80,7 @@ public sealed class Macd : ITValuePublisher
         Signal = signal;
         Histogram = new TValue(input.Time, histValue);
 
-        Pub?.Invoke(Last);
+        Pub?.Invoke(this, new TValueEventArgs { Value = Last, IsNew = isNew });
         return Last;
     }
 
@@ -100,6 +102,11 @@ public sealed class Macd : ITValuePublisher
         
         return new TSeries(t, v);
     }
+
+    private void Handle(object? sender, TValueEventArgs args)
+    {
+        Update(args.Value, args.IsNew);
+    }
     
     /// <summary>
     /// Calculates the MACD Line (Fast EMA - Slow EMA).
@@ -108,7 +115,7 @@ public sealed class Macd : ITValuePublisher
     public static void Calculate(ReadOnlySpan<double> source, Span<double> destination, int fastPeriod = 12, int slowPeriod = 26)
     {
         if (source.Length != destination.Length)
-            throw new ArgumentException("Source and destination must be same length");
+            throw new ArgumentException("Source and destination must be same length", nameof(destination));
             
         int len = source.Length;
         double[] fastBuffer = ArrayPool<double>.Shared.Rent(len);

lib/momentum/rsi/Rsi.cs

@@ -26,6 +26,7 @@ public sealed class Rsi : AbstractBase
     private readonly int _period;
     private readonly Rma _avgGain;
     private readonly Rma _avgLoss;
+    private readonly TValuePublishedHandler _handler;
     private double _prevValue;
     private double _p_prevValue;
 
@@ -39,6 +40,7 @@ public sealed class Rsi : AbstractBase
         _period = period;
         _avgGain = new Rma(period);
         _avgLoss = new Rma(period);
+        _handler = Handle;
         _prevValue = double.NaN;
         _p_prevValue = double.NaN;
 
@@ -48,7 +50,7 @@ public sealed class Rsi : AbstractBase
 
     public Rsi(ITValuePublisher source, int period = 14) : this(period)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -110,7 +112,7 @@ public sealed class Rsi : AbstractBase
         }
 
         Last = new TValue(input.Time, rsi);
-        PubEvent(Last);
+        PubEvent(Last, isNew);
         return Last;
     }
 
@@ -145,6 +147,11 @@ public sealed class Rsi : AbstractBase
         return new TSeries(t, v);
     }
 
+    private void Handle(object? sender, TValueEventArgs args)
+    {
+        Update(args.Value, args.IsNew);
+    }
+
     public override void Prime(ReadOnlySpan<double> source)
     {
         foreach (var value in source)
@@ -163,7 +170,7 @@ public sealed class Rsi : AbstractBase
     public static void Calculate(ReadOnlySpan<double> source, Span<double> output, int period)
     {
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
         if (period <= 0)
             throw new ArgumentException("Period must be greater than 0", nameof(period));
 

lib/momentum/rsx/Rsx.cs

@@ -27,6 +27,7 @@ public sealed class Rsx : ITValuePublisher
     private readonly int _period;
     private readonly double _alpha;
 
+    [StructLayout(LayoutKind.Auto)]
     private record struct State
     {
         // Momentum filters (3 stages, 2 filters each)
@@ -46,13 +47,14 @@ public sealed class Rsx : ITValuePublisher
 
     private State _state;
     private State _p_state;
+    private readonly TValuePublishedHandler _handler;
 
     /// <summary>
     /// Display name for the indicator.
     /// </summary>
     public string Name { get; }
 
-    public event Action<TValue>? Pub;
+    public event TValuePublishedHandler? Pub;
 
     /// <summary>
     /// The number of bars required to warm up the indicator.
@@ -72,11 +74,12 @@ public sealed class Rsx : ITValuePublisher
         WarmupPeriod = period;
         _alpha = 3.0 / (period + 2.0);
         Name = $"Rsx({period})";
+        _handler = Handle;
     }
 
     public Rsx(ITValuePublisher source, int period) : this(period)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
     /// <summary>
@@ -90,6 +93,8 @@ public sealed class Rsx : ITValuePublisher
     public bool IsHot => _state.IsInitialized;
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private void Handle(object? sender, TValueEventArgs args) => Update(args.Value, args.IsNew);
+
     public TValue Update(TValue input, bool isNew = true)
     {
         if (isNew)
@@ -177,7 +182,7 @@ public sealed class Rsx : ITValuePublisher
         }
 
         Last = new TValue(input.Time, rsx);
-        Pub?.Invoke(Last);
+        Pub?.Invoke(this, new TValueEventArgs { Value = Last, IsNew = isNew });
         return Last;
     }
 
@@ -219,7 +224,7 @@ public sealed class Rsx : ITValuePublisher
     public static void Batch(ReadOnlySpan<double> source, Span<double> output, int period)
     {
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
         if (period <= 0)
             throw new ArgumentException("Period must be greater than 0", nameof(period));
 

lib/momentum/vel/Vel.cs

@@ -22,12 +22,13 @@ public sealed class Vel : ITValuePublisher
     private readonly Pwma _pwma;
     private readonly Wma _wma;
     private readonly int _period;
+    private readonly TValuePublishedHandler _handler;
 
     public string Name { get; }
     public TValue Last { get; private set; }
     public bool IsHot => _pwma.IsHot && _wma.IsHot;
     public int WarmupPeriod { get; }
-    public event Action<TValue>? Pub;
+    public event TValuePublishedHandler? Pub;
 
     public Vel(int period)
     {
@@ -38,13 +39,17 @@ public sealed class Vel : ITValuePublisher
         _period = period;
         WarmupPeriod = period;
         Name = $"Vel({period})";
+        _handler = Handle;
     }
 
     public Vel(ITValuePublisher source, int period) : this(period)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private void Handle(object? sender, TValueEventArgs args) => Update(args.Value, args.IsNew);
+
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public TValue Update(TValue input, bool isNew = true)
     {
@@ -52,7 +57,7 @@ public sealed class Vel : ITValuePublisher
         var wma = _wma.Update(input, isNew);
 
         Last = new TValue(input.Time, pwma.Value - wma.Value);
-        Pub?.Invoke(Last);
+        Pub?.Invoke(this, new TValueEventArgs { Value = Last, IsNew = isNew });
         return Last;
     }
 
@@ -110,7 +115,7 @@ public sealed class Vel : ITValuePublisher
     public static void Batch(ReadOnlySpan<double> source, Span<double> output, int period)
     {
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
 
         Span<double> pwma = source.Length <= 1024 ? stackalloc double[source.Length] : new double[source.Length];
         Span<double> wma = source.Length <= 1024 ? stackalloc double[source.Length] : new double[source.Length];

lib/quantalib.csproj

@@ -43,11 +43,29 @@
   </ItemGroup>
 
   <ItemGroup>
+  
     <PackageReference Include="GitVersion.MsBuild" Version="6.5.1">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
+
     <PackageReference Include="JetBrains.Annotations" Version="2025.2.4" />
+
+    <PackageReference Include="Roslynator.Analyzers" Version="4.12.9">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
+    </PackageReference>
+
+    <PackageReference Include="Meziantou.Analyzer" Version="2.0.183">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
+    </PackageReference>
+
+  <PackageReference Include="SonarAnalyzer.CSharp" Version="10.*">
+    <PrivateAssets>all</PrivateAssets>
+    <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
+  </PackageReference>
+
   </ItemGroup>
 
   <ItemGroup>

lib/statistics/covariance/Covariance.cs

@@ -180,7 +180,7 @@ public sealed class Covariance : AbstractBase
     public static TSeries Calculate(TSeries sourceX, TSeries sourceY, int period, bool isPopulation = false)
     {
         if (sourceX.Count != sourceY.Count)
-            throw new ArgumentException("Source series must have the same length");
+            throw new ArgumentException("Source series must have the same length", nameof(sourceY));
 
         int len = sourceX.Count;
         var t = new List<long>(len);
@@ -201,7 +201,7 @@ public sealed class Covariance : AbstractBase
     public static void Batch(ReadOnlySpan<double> sourceX, ReadOnlySpan<double> sourceY, Span<double> output, int period, bool isPopulation = false)
     {
         if (sourceX.Length != sourceY.Length || sourceX.Length != output.Length)
-            throw new ArgumentException("All spans must have the same length");
+            throw new ArgumentException("All spans must have the same length", nameof(output));
         if (period < 2)
             throw new ArgumentException("Period must be greater than or equal to 2", nameof(period));
 

lib/statistics/linreg/LinReg.cs

@@ -36,9 +36,11 @@ public sealed class LinReg : AbstractBase
     private readonly double _sum_x;
     private readonly double _denominator;
 
+    [StructLayout(LayoutKind.Auto)]
     private record struct State(double SumY, double SumXY, double SumY2, double LastVal, double LastValidValue);
     private State _state;
     private State _p_state;
+    private readonly TValuePublishedHandler _handler;
 
     private int _tickCount;
     private const int ResyncInterval = 1000;
@@ -81,6 +83,7 @@ public sealed class LinReg : AbstractBase
         _buffer = new RingBuffer(period);
         Name = $"LinReg({period})";
         WarmupPeriod = period;
+        _handler = Handle;
 
         // Precalculate constants
         // sum_x = 0 + 1 + ... + (n-1) = n(n-1)/2
@@ -95,9 +98,12 @@ public sealed class LinReg : AbstractBase
 
     public LinReg(ITValuePublisher source, int period, int offset = 0) : this(period, offset)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private void Handle(object? sender, TValueEventArgs args) => Update(args.Value, args.IsNew);
+
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     private double GetValidValue(double input)
     {
@@ -250,7 +256,7 @@ public sealed class LinReg : AbstractBase
         }
 
         Last = new TValue(input.Time, result);
-        PubEvent(Last);
+        PubEvent(Last, isNew);
         return Last;
     }
 
@@ -329,7 +335,7 @@ public sealed class LinReg : AbstractBase
     public static void Calculate(ReadOnlySpan<double> source, Span<double> output, int period, int offset = 0, double initialLastValid = 0)
     {
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
         if (period <= 0)
             throw new ArgumentException("Period must be greater than 0", nameof(period));
 

lib/statistics/median/Median.Validation.Tests.cs

@@ -88,7 +88,7 @@ public sealed class MedianValidationTests : IDisposable
         }
     }
 
-    private static double CalculateMedian(List<double> sortedWindow)
+    private static double CalculateMedian(IReadOnlyList<double> sortedWindow)
     {
         int count = sortedWindow.Count;
         if (count == 0) return 0; // Or NaN

lib/statistics/median/Median.cs

@@ -25,6 +25,7 @@ public sealed class Median : AbstractBase
     private readonly int _period;
     private readonly RingBuffer _buffer;
     private readonly double[] _sortedBuffer;
+    private readonly TValuePublishedHandler _handler;
 
     /// <summary>
     /// Creates a Median indicator with the specified period.
@@ -40,11 +41,12 @@ public sealed class Median : AbstractBase
         _sortedBuffer = new double[period];
         Name = $"Median({period})";
         WarmupPeriod = period;
+        _handler = Handle;
     }
 
     public Median(ITValuePublisher source, int period) : this(period)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
     public Median(TSeries source, int period) : this(period)
@@ -54,7 +56,7 @@ public sealed class Median : AbstractBase
         {
             Last = new TValue(source.LastTime, Last.Value);
         }
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
     /// <summary>
@@ -79,6 +81,9 @@ public sealed class Median : AbstractBase
         }
     }
 
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private void Handle(object? sender, TValueEventArgs args) => Update(args.Value, args.IsNew);
+
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public override TValue Update(TValue input, bool isNew = true)
     {
@@ -123,7 +128,7 @@ public sealed class Median : AbstractBase
         }
 
         Last = new TValue(input.Time, median);
-        PubEvent(Last);
+        PubEvent(Last, isNew);
         return Last;
     }
 
@@ -202,7 +207,7 @@ public sealed class Median : AbstractBase
     public static void Batch(ReadOnlySpan<double> source, Span<double> output, int period)
     {
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
         if (period <= 0)
             throw new ArgumentException("Period must be greater than 0", nameof(period));
 

lib/statistics/skew/Skew.cs

@@ -205,7 +205,7 @@ public sealed class Skew : AbstractBase
     public static void Batch(ReadOnlySpan<double> source, Span<double> output, int period, bool isPopulation = false)
     {
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
         if (period < 3)
             throw new ArgumentException("Period must be greater than or equal to 3", nameof(period));
 

lib/statistics/variance/Variance.cs

@@ -181,7 +181,7 @@ public sealed class Variance : AbstractBase
     public static void Batch(ReadOnlySpan<double> source, Span<double> output, int period, bool isPopulation = false)
     {
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
         if (period < 2)
             throw new ArgumentException("Period must be greater than or equal to 2", nameof(period));
 

lib/trends/alma/Alma.cs

@@ -33,7 +33,7 @@ public sealed class Alma : AbstractBase, IDisposable
     private readonly double _invWeightSum;
     private readonly RingBuffer _buffer;
     private readonly ITValuePublisher? _source;
-    private readonly Action<TValue>? _pubHandler;
+    private readonly TValuePublishedHandler? _pubHandler;
 
     private record struct State(double LastValidValue);
     private State _state;
@@ -84,10 +84,13 @@ public sealed class Alma : AbstractBase, IDisposable
         : this(period, offset, sigma)
     {
         _source = source;
-        _pubHandler = (item) => Update(item);
+        _pubHandler = Handle;
         _source.Pub += _pubHandler;
     }
 
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private void Handle(object? sender, TValueEventArgs e) => Update(e.Value, e.IsNew);
+
     public void Dispose()
     {
         if (_source != null && _pubHandler != null)
@@ -235,7 +238,7 @@ public sealed class Alma : AbstractBase, IDisposable
         if (period <= 0)
             throw new ArgumentException("Period must be greater than 0", nameof(period));
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
 
         // Precompute weights
         // Use stackalloc for small periods to avoid heap allocation, ArrayPool for large

lib/trends/bessel/Bessel.cs

@@ -23,6 +23,7 @@ namespace QuanTAlib;
 [SkipLocalsInit]
 public sealed class Bessel : AbstractBase, IDisposable
 {
+    [StructLayout(LayoutKind.Auto)]
     private record struct State(double F1, double F2, double LastValidValue, int Count, bool IsHot)
     {
         public static State New() => new()
@@ -37,7 +38,7 @@ public sealed class Bessel : AbstractBase, IDisposable
 
     private readonly double _c1, _c2, _c3;
     private readonly ITValuePublisher? _publisher;
-    private readonly Action<TValue>? _handler;
+    private readonly TValuePublishedHandler? _handler;
     private State _state = State.New();
     private State _p_state = State.New();
 
@@ -68,7 +69,7 @@ public sealed class Bessel : AbstractBase, IDisposable
     public Bessel(ITValuePublisher source, int length) : this(length)
     {
         _publisher = source;
-        _handler = item => Update(item);
+        _handler = Handle;
         source.Pub += _handler;
     }
 
@@ -84,7 +85,7 @@ public sealed class Bessel : AbstractBase, IDisposable
         }
 
         _publisher = source;
-        _handler = item => Update(item);
+        _handler = Handle;
         source.Pub += _handler;
     }
 
@@ -291,7 +292,7 @@ public sealed class Bessel : AbstractBase, IDisposable
             throw new ArgumentException("Length must be greater than 0", nameof(length));
 
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
 
         if (source.Length == 0)
             return;
@@ -309,6 +310,9 @@ public sealed class Bessel : AbstractBase, IDisposable
         CalculateCore(source, output, c1, c2, c3, length, ref state);
     }
 
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private void Handle(object? sender, TValueEventArgs e) => Update(e.Value, e.IsNew);
+
     public override void Reset()
     {
         _state = State.New();

lib/trends/bilateral/Bilateral.Validation.Tests.cs

@@ -111,7 +111,7 @@ public sealed class BilateralValidationTests : IDisposable
         _output.WriteLine("Bilateral Span validated successfully against Reference");
     }
 
-    private List<double> GetReferenceData(int period, double sigmaSRatio, double sigmaRMult)
+    private IReadOnlyList<double> GetReferenceData(int period, double sigmaSRatio, double sigmaRMult)
     {
         var reference = new BilateralReference(period, sigmaSRatio, sigmaRMult);
         var results = new List<double>();
@@ -180,7 +180,7 @@ public sealed class BilateralValidationTests : IDisposable
             return sumWeights < 1e-10 ? centerVal : sumWeightedSrc / sumWeights;
         }
 
-        private static double CalculateStDev(List<double> values)
+        private static double CalculateStDev(IReadOnlyList<double> values)
         {
             if (values.Count < 2) return 0;
             

lib/trends/bilateral/Bilateral.cs

@@ -28,9 +28,11 @@ public sealed class Bilateral : AbstractBase
     private readonly RingBuffer _buffer;
     private readonly double[] _spatialWeights;
 
+    [StructLayout(LayoutKind.Auto)]
     private record struct State(double SumSq, double LastValidValue);
     private State _state;
     private State _p_state;
+    private readonly TValuePublishedHandler _handler;
 
     /// <summary>
     /// Creates a Bilateral Filter with specified parameters.
@@ -49,6 +51,7 @@ public sealed class Bilateral : AbstractBase
         _buffer = new RingBuffer(period);
         Name = $"Bilateral({period}, {sigmaSRatio:F2}, {sigmaRMult:F2})";
         WarmupPeriod = period;
+        _handler = Handle;
 
         _spatialWeights = new double[period];
         PrecalculateSpatialWeights();
@@ -57,7 +60,7 @@ public sealed class Bilateral : AbstractBase
     public Bilateral(ITValuePublisher source, int period, double sigmaSRatio = 0.5, double sigmaRMult = 1.0) 
         : this(period, sigmaSRatio, sigmaRMult)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
     public override bool IsHot => _buffer.IsFull;
@@ -113,6 +116,9 @@ public sealed class Bilateral : AbstractBase
         _p_state = _state;
     }
 
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private void Handle(object? sender, TValueEventArgs args) => Update(args.Value, args.IsNew);
+
     public override TSeries Update(TSeries source)
     {
         if (source.Count == 0) return [];
@@ -171,7 +177,7 @@ public sealed class Bilateral : AbstractBase
 
         double result = CalculateBilateral();
         Last = new TValue(input.Time, result);
-        PubEvent(Last);
+        PubEvent(Last, isNew);
         return Last;
     }
 

lib/trends/blma/Blma.Tests.cs

@@ -139,7 +139,8 @@ public class BlmaTests
         var input = new double[] { 1, 2, 3, 4, 5 };
         var timestamps = new List<DateTime>();
         
-        blma.Pub += (item) => timestamps.Add(item.AsDateTime);
+        blma.Pub += (object? sender, TValueEventArgs args) => timestamps.Add(args.Value.AsDateTime);
+
         
         blma.Prime(input);
         
@@ -164,7 +165,8 @@ public class BlmaTests
         ];
         var timestamps = new List<DateTime>();
         
-        blma.Pub += (item) => timestamps.Add(item.AsDateTime);
+        blma.Pub += (object? sender, TValueEventArgs args) => timestamps.Add(args.Value.AsDateTime);
+
         
         blma.Prime(input);
         

lib/trends/blma/Blma.Validation.Tests.cs

@@ -42,7 +42,7 @@ public class BlmaValidationTests
         }
     }
 
-    private static List<double> CalculateReference(TSeries source, int period)
+    private static IReadOnlyList<double> CalculateReference(TSeries source, int period)
     {
         var result = new List<double>();
         var buffer = new List<double>();

lib/trends/blma/Blma.cs

@@ -11,6 +11,7 @@ public sealed class Blma : AbstractBase, IDisposable
     private readonly RingBuffer _buffer;
     private readonly double[] _weights;
     private readonly double _weightSum;
+    private readonly TValuePublishedHandler _handler;
     private ITValuePublisher? _publisher;
     private bool _hasLast;
 
@@ -31,26 +32,27 @@ public sealed class Blma : AbstractBase, IDisposable
         
         // Pre-calculate weights for the full period
         _weightSum = CalculateWeights(period, _weights);
+        _handler = Handle;
     }
 
     public Blma(ITValuePublisher source, int period) : this(period)
     {
         _publisher = source;
-        source.Pub += Handle;
+        source.Pub += _handler;
     }
 
     public void Dispose()
     {
         if (_publisher != null)
         {
-            _publisher.Pub -= Handle;
+            _publisher.Pub -= _handler;
             _publisher = null;
         }
     }
 
-    private void Handle(TValue value)
+    private void Handle(object? sender, TValueEventArgs args)
     {
-        Update(value);
+        Update(args.Value, args.IsNew);
     }
 
     public override void Reset()
@@ -118,7 +120,7 @@ public sealed class Blma : AbstractBase, IDisposable
         var tValue = new TValue(input.Time, result);
         Last = tValue;
         _hasLast = true;
-        PubEvent(tValue);
+        PubEvent(tValue, isNew);
         return tValue;
     }
 

lib/trends/butter/Butter.Validation.Tests.cs

@@ -88,7 +88,7 @@ public class ButterValidationTests
         }
     }
 
-    private static List<double> CalculateReference(TSeries source, int period)
+    private static IReadOnlyList<double> CalculateReference(TSeries source, int period)
     {
         var result = new List<double>();
         

lib/trends/butter/Butter.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 
 namespace QuanTAlib;
 
@@ -8,9 +9,11 @@ public sealed class Butter : AbstractBase
     private readonly int _period;
     private double _a1, _a2, _b0, _b1, _b2;
     private double _invA0;
+    private readonly TValuePublishedHandler _handler;
     private State _state;
     private State _p_state;
 
+    [StructLayout(LayoutKind.Auto)]
     private record struct State
     {
         public double X1, X2;
@@ -30,18 +33,18 @@ public sealed class Butter : AbstractBase
         CalculateCoefficients();
         Name = $"Butter({_period})";
         WarmupPeriod = 2;
+        _handler = Handle;
         Init();
     }
 
-    public Butter(object source, int period) : this(period)
+    public Butter(ITValuePublisher source, int period) : this(period)
     {
-        var pub = (ITValuePublisher)source;
-        pub.Pub += Handle;
+        source.Pub += _handler;
     }
 
-    private void Handle(TValue value)
+    private void Handle(object? sender, TValueEventArgs args)
     {
-        Update(value);
+        Update(args.Value, args.IsNew);
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -121,7 +124,7 @@ public sealed class Butter : AbstractBase
 
         var tValue = new TValue(input.Time, y);
         Last = tValue;
-        PubEvent(tValue);
+        PubEvent(tValue, isNew);
         return tValue;
     }
 

lib/trends/conv/Conv.cs

@@ -28,7 +28,7 @@ public sealed class Conv : AbstractBase, IDisposable
     private readonly double[] _kernel;
     private readonly RingBuffer _buffer;
     private readonly ITValuePublisher? _source;
-    private readonly Action<TValue>? _subHandler;
+    private readonly TValuePublishedHandler? _subHandler;
 
     private record struct State(double LastValidValue);
     private State _state;
@@ -54,7 +54,7 @@ public sealed class Conv : AbstractBase, IDisposable
     public Conv(ITValuePublisher source, double[] kernel) : this(kernel)
     {
         _source = source;
-        _subHandler = (item) => Update(item);
+        _subHandler = Handle;
         _source.Pub += _subHandler;
     }
 
@@ -66,6 +66,8 @@ public sealed class Conv : AbstractBase, IDisposable
         }
     }
 
+    private void Handle(object? sender, TValueEventArgs e) => Update(e.Value, e.IsNew);
+
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     private double GetValidValue(double input)
     {
@@ -204,7 +206,7 @@ public sealed class Conv : AbstractBase, IDisposable
     public static void Batch(ReadOnlySpan<double> source, Span<double> output, double[] kernel)
     {
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
         if (kernel == null || kernel.Length == 0)
             throw new ArgumentException("Kernel must not be empty", nameof(kernel));
 

lib/trends/dema/Dema.cs

@@ -24,6 +24,7 @@ namespace QuanTAlib;
 [SkipLocalsInit]
 public sealed class Dema : AbstractBase, IDisposable
 {
+    [StructLayout(LayoutKind.Auto)]
     private record struct EmaState(double Ema, double E, bool IsHot, bool IsCompensated)
     {
         public static EmaState New() => new() { Ema = 0, E = 1.0, IsHot = false, IsCompensated = false };
@@ -40,7 +41,7 @@ public sealed class Dema : AbstractBase, IDisposable
     private double _lastValidValue = double.NaN;
     private double _p_lastValidValue = double.NaN;
     private readonly ITValuePublisher? _publisher;
-    private readonly Action<TValue>? _listener;
+    private readonly TValuePublishedHandler? _listener;
 
     public override bool IsHot => _state2.IsHot;
 
@@ -57,7 +58,7 @@ public sealed class Dema : AbstractBase, IDisposable
     public Dema(ITValuePublisher source, int period) : this(period)
     {
         _publisher = source;
-        _listener = (item) => Update(item);
+        _listener = Handle;
         source.Pub += _listener;
     }
 
@@ -230,7 +231,7 @@ public sealed class Dema : AbstractBase, IDisposable
     public static void Calculate(ReadOnlySpan<double> source, Span<double> output, double alpha)
     {
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
         if (alpha <= 0 || alpha > 1)
             throw new ArgumentException("Alpha must be between 0 and 1", nameof(alpha));
 
@@ -328,4 +329,6 @@ public sealed class Dema : AbstractBase, IDisposable
             _publisher.Pub -= _listener;
         }
     }
+
+    private void Handle(object? sender, TValueEventArgs e) => Update(e.Value, e.IsNew);
 }

lib/trends/dwma/Dwma.cs

@@ -20,6 +20,7 @@ public sealed class Dwma : AbstractBase
     private readonly int _period;
     private readonly Wma _wma1;
     private readonly Wma _wma2;
+    private readonly TValuePublishedHandler _handler;
 
     public override bool IsHot => _wma1.IsHot && _wma2.IsHot;
 
@@ -35,13 +36,14 @@ public sealed class Dwma : AbstractBase
         _period = period;
         _wma1 = new Wma(period);
         _wma2 = new Wma(period);
+        _handler = Handle;
         Name = $"Dwma({period})";
         WarmupPeriod = period * 2;
     }
 
     public Dwma(ITValuePublisher source, int period) : this(period)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -49,7 +51,7 @@ public sealed class Dwma : AbstractBase
     {
         TValue wma1Result = _wma1.Update(input, isNew);
         Last = _wma2.Update(wma1Result, isNew);
-        PubEvent(Last);
+        PubEvent(Last, isNew);
         return Last;
     }
 
@@ -88,6 +90,11 @@ public sealed class Dwma : AbstractBase
         return new TSeries(t, v);
     }
 
+    private void Handle(object? sender, TValueEventArgs args)
+    {
+        Update(args.Value, args.IsNew);
+    }
+
     public override void Prime(ReadOnlySpan<double> source)
     {
         Reset();
@@ -110,7 +117,7 @@ public sealed class Dwma : AbstractBase
             throw new ArgumentOutOfRangeException(nameof(period), "Period must be greater than zero");
 
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
 
         // We need a temporary buffer for the first WMA pass
         // Use stackalloc for small sizes, heap for large

lib/trends/ema/Ema.cs

@@ -27,6 +27,7 @@ namespace QuanTAlib;
 [SkipLocalsInit]
 public sealed class Ema : AbstractBase
 {
+    [StructLayout(LayoutKind.Auto)]
     private record struct State(double Ema, double E, bool IsHot, bool IsCompensated)
     {
         public static State New() => new() { Ema = 0, E = 1.0, IsHot = false, IsCompensated = false };
@@ -63,7 +64,7 @@ public sealed class Ema : AbstractBase
     /// <param name="period">Period for EMA calculation</param>
     public Ema(ITValuePublisher source, int period) : this(period)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += Handle;
     }
 
     public Ema(TSeries source, int period) : this(period)
@@ -73,7 +74,7 @@ public sealed class Ema : AbstractBase
         {
             Last = new TValue(source.LastTime, Last.Value);
         }
-        source.Pub += (item) => Update(item);
+        source.Pub += Handle;
     }
 
     /// <summary>
@@ -180,6 +181,9 @@ public sealed class Ema : AbstractBase
         _p_lastValidValue = _lastValidValue;
     }
 
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private void Handle(object? sender, TValueEventArgs e) => Update(e.Value, e.IsNew);
+
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     private double GetValidValue(double input)
     {

lib/trends/hma/Hma.cs

@@ -27,6 +27,7 @@ public sealed class Hma : AbstractBase
     private readonly Wma _wmaFull;
     private readonly Wma _wmaHalf;
     private readonly Wma _wmaSqrt;
+    private readonly TValuePublishedHandler _handler;
     private int _sampleCount;
 
     public override bool IsHot => _sampleCount >= WarmupPeriod;
@@ -42,6 +43,7 @@ public sealed class Hma : AbstractBase
         _wmaFull = new Wma(period);
         _wmaHalf = new Wma(halfPeriod);
         _wmaSqrt = new Wma(_sqrtPeriod);
+        _handler = Handle;
 
         Name = $"Hma({period})";
         WarmupPeriod = period + _sqrtPeriod - 1; // WMA needs period, then WMA(sqrt) needs sqrt_period. Total lag/warmup.
@@ -49,7 +51,7 @@ public sealed class Hma : AbstractBase
 
     public Hma(ITValuePublisher source, int period) : this(period)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -69,7 +71,7 @@ public sealed class Hma : AbstractBase
         // 4. Calculate HMA = WMA(sqrt(n), intermediate)
         Last = _wmaSqrt.Update(new TValue(input.Time, intermediate), isNew);
 
-        PubEvent(Last);
+        PubEvent(Last, isNew);
         return Last;
     }
 
@@ -115,6 +117,11 @@ public sealed class Hma : AbstractBase
         return new TSeries(t, v);
     }
 
+    private void Handle(object? sender, TValueEventArgs args)
+    {
+        Update(args.Value, args.IsNew);
+    }
+
     public override void Prime(ReadOnlySpan<double> source)
     {
         foreach (var value in source)
@@ -141,7 +148,7 @@ public sealed class Hma : AbstractBase
     public static void Calculate(ReadOnlySpan<double> source, Span<double> output, int period)
     {
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
         if (period <= 1)
             throw new ArgumentException("Period must be greater than 1", nameof(period));
 

lib/trends/htit/Htit.cs

@@ -20,6 +20,7 @@ public sealed class Htit : AbstractBase
 {
     public override bool IsHot => _state.Index >= WarmupPeriod;
 
+    [StructLayout(LayoutKind.Auto)]
     private record struct State(
         double I2, double Q2, double Re, double Im,
         double Period, double SmoothPeriod,
@@ -34,6 +35,7 @@ public sealed class Htit : AbstractBase
     private readonly RingBuffer _i1Buffer;
     private readonly RingBuffer _q1Buffer;
     private readonly RingBuffer _itBuffer;
+    private readonly TValuePublishedHandler _handler;
 
     // High-precision constants
     private const double c1 = 5.0 / 52.0;   // ~0.09615385
@@ -47,7 +49,8 @@ public sealed class Htit : AbstractBase
     {
         Name = "Htit";
         WarmupPeriod = 12;
-        
+        _handler = Handle;
+
         // Initialize buffers with size 8 (power of 2) for consistency with Calculate optimization
         // except priceBuffer which needs to be larger for IT calculation
         _priceBuffer = new RingBuffer(64); // Needs to hold enough history for IT calculation (up to 50 bars)
@@ -62,7 +65,7 @@ public sealed class Htit : AbstractBase
 
     public Htit(ITValuePublisher source) : this()
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
     private void Init()
@@ -215,7 +218,7 @@ public sealed class Htit : AbstractBase
     {
         double val = Step(input.Value, isNew);
         Last = new TValue(input.Time, val);
-        PubEvent(Last);
+        PubEvent(Last, isNew);
         return Last;
     }
 
@@ -237,6 +240,11 @@ public sealed class Htit : AbstractBase
         return new TSeries(t, v);
     }
 
+    private void Handle(object? sender, TValueEventArgs args)
+    {
+        Update(args.Value, args.IsNew);
+    }
+
     public override void Prime(ReadOnlySpan<double> source)
     {
         foreach (var value in source)
@@ -255,7 +263,7 @@ public sealed class Htit : AbstractBase
     public static void Calculate(ReadOnlySpan<double> source, Span<double> output)
     {
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
 
         if (source.Length == 0) return;
 

lib/trends/jma/Jma.cs

@@ -33,11 +33,13 @@ public sealed class Jma : AbstractBase
     private readonly RingBuffer _devBuffer;
     private readonly RingBuffer _volBuffer;
     private readonly double[] _sorted;
+    private readonly TValuePublishedHandler _handler;
 
     // Streaming state (current + previous snapshot for isNew=false)
     private State _state;
     private State _p_state;
 
+    [StructLayout(LayoutKind.Auto)]
     private record struct State
     {
         // Jurik "envelope" anchors
@@ -97,6 +99,7 @@ public sealed class Jma : AbstractBase
         // same warmup heuristic used in the AFL port (SetBarsRequired)
         WarmupPeriod = (int)Math.Ceiling(20.0 + 80.0 * Math.Pow(period, 0.36));
 
+        _handler = Handle;
         Name = $"Jma({period},{phase},{power})"; // power kept for signature compatibility
 
         _devBuffer = new RingBuffer(DevWindowSize);
@@ -109,7 +112,7 @@ public sealed class Jma : AbstractBase
     public Jma(ITValuePublisher source, int period, int phase = 0, double power = 0.45)
         : this(period, phase, power)
     {
-        source.Pub += item => Update(item);
+        source.Pub += _handler;
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -238,7 +241,7 @@ public sealed class Jma : AbstractBase
     {
         double j = Step(input.Value, isNew);
         Last = new TValue(input.Time, j);
-        PubEvent(Last);
+        PubEvent(Last, isNew);
         return Last;
     }
 
@@ -289,6 +292,8 @@ public sealed class Jma : AbstractBase
         return new TSeries(t, v);
     }
 
+    private void Handle(object? sender, TValueEventArgs args) => Update(args.Value, args.IsNew);
+
     public override void Prime(ReadOnlySpan<double> source)
     {
         foreach (var value in source)

lib/trends/kama/Kama.cs

@@ -25,7 +25,9 @@ public sealed class Kama : AbstractBase
     private readonly double _fastAlpha;
     private readonly double _slowAlpha;
     private readonly RingBuffer _buffer;
+    private readonly TValuePublishedHandler _handler;
 
+    [StructLayout(LayoutKind.Auto)]
     private record struct State(double Kama, double VolatilitySum, double NextDiffOut, double LastValidValue);
     private State _state;
     private State _p_state;
@@ -55,6 +57,7 @@ public sealed class Kama : AbstractBase
 
         _fastAlpha = 2.0 / (fastPeriod + 1);
         _slowAlpha = 2.0 / (slowPeriod + 1);
+        _handler = Handle;
 
         Name = $"Kama({period}, {fastPeriod}, {slowPeriod})";
         WarmupPeriod = period + 1;
@@ -68,7 +71,7 @@ public sealed class Kama : AbstractBase
     public Kama(ITValuePublisher source, int period = 10, int fastPeriod = 2, int slowPeriod = 30)
         : this(period, fastPeriod, slowPeriod)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -177,7 +180,7 @@ public sealed class Kama : AbstractBase
         }
 
         Last = new TValue(input.Time, _state.Kama);
-        PubEvent(Last);
+        PubEvent(Last, isNew);
         return Last;
     }
 
@@ -205,6 +208,11 @@ public sealed class Kama : AbstractBase
         return new TSeries(t, v);
     }
 
+    private void Handle(object? sender, TValueEventArgs args)
+    {
+        Update(args.Value, args.IsNew);
+    }
+
     public override void Prime(ReadOnlySpan<double> source)
     {
         foreach (var value in source)
@@ -225,7 +233,7 @@ public sealed class Kama : AbstractBase
         if (fastPeriod <= 0) throw new ArgumentException("Fast period must be greater than 0", nameof(fastPeriod));
         if (slowPeriod <= 0) throw new ArgumentException("Slow period must be greater than 0", nameof(slowPeriod));
         if (fastPeriod >= slowPeriod) throw new ArgumentException("Fast period must be less than slow period", nameof(fastPeriod));
-        if (source.Length != output.Length) throw new ArgumentException("Source and output must have the same length");
+        if (source.Length != output.Length) throw new ArgumentException("Source and output must have the same length", nameof(output));
 
         double fastAlpha = 2.0 / (fastPeriod + 1);
         double slowAlpha = 2.0 / (slowPeriod + 1);

lib/trends/lsma/Lsma.cs

@@ -33,7 +33,9 @@ public sealed class Lsma : AbstractBase
 
     private readonly double _sum_x;
     private readonly double _denominator;
+    private readonly TValuePublishedHandler _handler;
 
+    [StructLayout(LayoutKind.Auto)]
     private record struct State(double SumY, double SumXY, double LastVal, double LastValidValue);
     private State _state;
     private State _p_state;
@@ -59,6 +61,7 @@ public sealed class Lsma : AbstractBase
         _buffer = new RingBuffer(period);
         Name = $"Lsma({period})";
         WarmupPeriod = period;
+        _handler = Handle;
 
         // Precalculate constants
         // sum_x = 0 + 1 + ... + (n-1) = n(n-1)/2
@@ -73,9 +76,11 @@ public sealed class Lsma : AbstractBase
 
     public Lsma(ITValuePublisher source, int period, int offset = 0) : this(period, offset)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
+    private void Handle(object? sender, TValueEventArgs e) => Update(e.Value, e.IsNew);
+
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     private double GetValidValue(double input)
     {
@@ -197,7 +202,7 @@ public sealed class Lsma : AbstractBase
         }
 
         Last = new TValue(input.Time, result);
-        PubEvent(Last);
+        PubEvent(Last, isNew);
         return Last;
     }
 
@@ -282,7 +287,7 @@ public sealed class Lsma : AbstractBase
     public static void Calculate(ReadOnlySpan<double> source, Span<double> output, int period, int offset = 0, double initialLastValid = 0)
     {
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
         if (period <= 0)
             throw new ArgumentException("Period must be greater than 0", nameof(period));
 

lib/trends/mama/Mama.Tests.cs

@@ -57,7 +57,7 @@ public class MamaTests
 
         // Manually chain for test
         bool eventFired = false;
-        mama.Pub += (item) => eventFired = true;
+        mama.Pub += (object? sender, TValueEventArgs args) => eventFired = true;
 
         mama.Update(new TValue(DateTime.UtcNow, 100.0));
 

lib/trends/mama/Mama.cs

@@ -18,7 +18,9 @@ public sealed class Mama : AbstractBase
     private readonly double _fastLimit;
     private readonly double _slowLimit;
     private readonly double _scaledFastLimit;
+    private readonly TValuePublishedHandler _handler;
 
+    [StructLayout(LayoutKind.Auto)]
     private record struct State(
         double Period, double Phase, double Mama, double Fama, double SumPr,
         double I2, double Q2, double Re, double Im, double LastValidPrice, int Index
@@ -55,7 +57,7 @@ public sealed class Mama : AbstractBase
     {
         if (fastLimit <= slowLimit || fastLimit <= 0 || slowLimit <= 0)
         {
-            throw new ArgumentException("FastLimit must be > SlowLimit and > 0");
+            throw new ArgumentException("FastLimit must be > SlowLimit and > 0", nameof(fastLimit));
         }
         _fastLimit = fastLimit;
         _slowLimit = slowLimit;
@@ -69,14 +71,17 @@ public sealed class Mama : AbstractBase
 
         Name = $"Mama({fastLimit:F2},{slowLimit:F2})";
         WarmupPeriod = 50;
+        _handler = Handle;
         Init();
     }
 
     public Mama(ITValuePublisher source, double fastLimit = 0.5, double slowLimit = 0.05) : this(fastLimit, slowLimit)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
+    private void Handle(object? sender, TValueEventArgs e) => Update(e.Value, e.IsNew);
+
     private void Init()
     {
         Reset();
@@ -229,7 +234,7 @@ public sealed class Mama : AbstractBase
         double mama = Step(input.Value, isNew);
         Last = new TValue(input.Time, mama);
         Fama = new TValue(input.Time, _state.Fama);
-        PubEvent(Last);
+        PubEvent(Last, isNew);
         return Last;
     }
 

lib/trends/mgdi/Mgdi.cs

@@ -23,7 +23,9 @@ public sealed class Mgdi : AbstractBase
 {
     private readonly int _period;
     private readonly double _k;
+    private readonly TValuePublishedHandler _handler;
 
+    [StructLayout(LayoutKind.Auto)]
     private record struct State(double LastMgdi, double LastValidValue, int Count, bool HasValidValue);
     private State _state;
     private State _p_state;
@@ -38,14 +40,17 @@ public sealed class Mgdi : AbstractBase
         _k = k;
         Name = $"Mgdi({period},{k})";
         WarmupPeriod = period;
+        _handler = Handle;
         Init();
     }
 
     public Mgdi(ITValuePublisher source, int period = 14, double k = 0.6) : this(period, k)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
+    private void Handle(object? sender, TValueEventArgs e) => Update(e.Value, e.IsNew);
+
     private void Init()
     {
         _state = default;
@@ -110,7 +115,7 @@ public sealed class Mgdi : AbstractBase
         }
 
         Last = new TValue(input.Time, _state.LastMgdi);
-        PubEvent(Last);
+        PubEvent(Last, isNew);
         return Last;
     }
 
@@ -163,7 +168,7 @@ public sealed class Mgdi : AbstractBase
         if (double.IsNaN(k) || double.IsInfinity(k) || k <= 0) throw new ArgumentOutOfRangeException(nameof(k), "k must be a finite value greater than 0");
 
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
 
         if (source.Length == 0) return;
 

lib/trends/pwma/Pwma.cs

@@ -33,7 +33,9 @@ public sealed class Pwma : AbstractBase
     private readonly double _divisor;
     private readonly RingBuffer _buffer;
     private readonly RingBuffer _p_buffer;
+    private readonly TValuePublishedHandler _handler;
 
+    [StructLayout(LayoutKind.Auto)]
     private record struct State(double Sum, double WSum, double PSum, double LastInput, double LastValidValue, int TickCount);
     private State _state;
     private State _p_state;
@@ -52,13 +54,16 @@ public sealed class Pwma : AbstractBase
         _p_buffer = new RingBuffer(period);
         Name = $"Pwma({period})";
         WarmupPeriod = period;
+        _handler = Handle;
     }
 
     public Pwma(ITValuePublisher source, int period) : this(period)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
+    private void Handle(object? sender, TValueEventArgs e) => Update(e.Value, e.IsNew);
+
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     private double GetValidValue(double input)
     {
@@ -152,7 +157,7 @@ public sealed class Pwma : AbstractBase
         double count = _buffer.Count;
         double currentDivisor = _buffer.IsFull ? _divisor : count * (count + 1.0) * (2.0 * count + 1.0) / 6.0;
         Last = new TValue(input.Time, _state.PSum / currentDivisor);
-        PubEvent(Last);
+        PubEvent(Last, isNew);
         return Last;
     }
 
@@ -231,7 +236,7 @@ public sealed class Pwma : AbstractBase
     public static void Calculate(ReadOnlySpan<double> source, Span<double> output, int period)
     {
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
         if (period <= 0)
             throw new ArgumentException("Period must be greater than 0", nameof(period));
 

lib/trends/rma/Rma.cs

@@ -45,7 +45,7 @@ public sealed class Rma : AbstractBase
     public Rma(ITValuePublisher source, int period) : this(period)
     {
         ArgumentNullException.ThrowIfNull(source);
-        source.Pub += (item) => Update(item);
+        source.Pub += Handle;
     }
 
     /// <summary>
@@ -61,7 +61,7 @@ public sealed class Rma : AbstractBase
         {
             Last = new TValue(source.LastTime, Last.Value);
         }
-        source.Pub += (item) => Update(item);
+        source.Pub += Handle;
     }
 
     /// <summary>
@@ -80,6 +80,8 @@ public sealed class Rma : AbstractBase
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private void Handle(object? sender, TValueEventArgs e) => Update(e.Value, e.IsNew);
+
     public override TValue Update(TValue input, bool isNew = true)
     {
         TValue result = _ema.Update(input, isNew);

lib/trends/sma/Sma.cs

@@ -30,7 +30,9 @@ public sealed class Sma : AbstractBase
 {
     private readonly int _period;
     private readonly RingBuffer _buffer;
+    private readonly TValuePublishedHandler _handler;
 
+    [StructLayout(LayoutKind.Auto)]
     private record struct State(double Sum, double LastInput, double LastValidValue, int TickCount);
     private State _state;
     private State _p_state;
@@ -50,11 +52,12 @@ public sealed class Sma : AbstractBase
         _buffer = new RingBuffer(period);
         Name = $"Sma({period})";
         WarmupPeriod = period;
+        _handler = Handle;
     }
 
     public Sma(ITValuePublisher source, int period) : this(period)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
     public Sma(TSeries source, int period) : this(period)
@@ -64,9 +67,11 @@ public sealed class Sma : AbstractBase
         {
             Last = new TValue(source.LastTime, Last.Value);
         }
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
+    private void Handle(object? sender, TValueEventArgs e) => Update(e.Value, e.IsNew);
+
     /////////////////////////////////////////////////////////////////////////////////////////////////
     // Mode B: Streaming (Stateful)
     /////////////////////////////////////////////////////////////////////////////////////////////////
@@ -198,7 +203,7 @@ public sealed class Sma : AbstractBase
 
         double result = _buffer.Count > 0 ? _state.Sum / _buffer.Count : double.NaN;
         Last = new TValue(input.Time, result);
-        PubEvent(Last);
+        PubEvent(Last, isNew);
         return Last;
     }
 
@@ -253,7 +258,7 @@ public sealed class Sma : AbstractBase
     public static void Batch(ReadOnlySpan<double> source, Span<double> output, int period)
     {
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
         if (period <= 0)
             throw new ArgumentException("Period must be greater than 0", nameof(period));
 

lib/trends/ssf/Ssf.cs

@@ -19,12 +19,14 @@ namespace QuanTAlib;
 [SkipLocalsInit]
 public sealed class Ssf : AbstractBase
 {
+    [StructLayout(LayoutKind.Auto)]
     private record struct State(double Ssf1, double Ssf2, double PrevInput, double LastValidValue, int Count, bool IsHot)
     {
         public static State New() => new() { Ssf1 = 0, Ssf2 = 0, PrevInput = 0, LastValidValue = 0, Count = 0, IsHot = false };
     }
 
     private readonly double _c1, _c2, _c3;
+    private readonly TValuePublishedHandler _handler;
     private State _state = State.New();
     private State _p_state = State.New();
 
@@ -52,6 +54,7 @@ public sealed class Ssf : AbstractBase
 
         Name = $"Ssf({period})";
         WarmupPeriod = period;
+        _handler = Handle;
     }
 
     /// <summary>
@@ -61,7 +64,7 @@ public sealed class Ssf : AbstractBase
     /// <param name="period">Period for SSF calculation</param>
     public Ssf(ITValuePublisher source, int period) : this(period)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
     public Ssf(TSeries source, int period) : this(period)
@@ -71,9 +74,11 @@ public sealed class Ssf : AbstractBase
         {
             Last = new TValue(source.LastTime, Last.Value);
         }
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
+    private void Handle(object? sender, TValueEventArgs e) => Update(e.Value, e.IsNew);
+
     public override bool IsHot => _state.IsHot;
 
     public override void Prime(ReadOnlySpan<double> source)
@@ -171,7 +176,7 @@ public sealed class Ssf : AbstractBase
             _state.IsHot = true;
 
         Last = new TValue(input.Time, ssf);
-        PubEvent(Last);
+        PubEvent(Last, isNew);
         return Last;
     }
 
@@ -276,7 +281,7 @@ public sealed class Ssf : AbstractBase
         double c1 = 1.0 - c2 - c3;
 
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
 
         if (source.Length == 0) return;
 

lib/trends/super/Super.cs

@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 
 namespace QuanTAlib;
 
@@ -15,6 +16,7 @@ public sealed class Super : ITValuePublisher
     private TBar _lastInput;
     private int _sampleCount;
 
+    [StructLayout(LayoutKind.Auto)]
     private record struct State
     {
         public bool IsBullish;
@@ -33,7 +35,7 @@ public sealed class Super : ITValuePublisher
     /// </summary>
     public string Name => $"Super({_period},{_multiplier})";
 
-    public event Action<TValue>? Pub;
+    public event TValuePublishedHandler? Pub;
 
     /// <summary>
     /// Current SuperTrend value.
@@ -213,7 +215,7 @@ public sealed class Super : ITValuePublisher
         UpperBand = new TValue(input.Time, upperBand);
         LowerBand = new TValue(input.Time, lowerBand);
 
-        Pub?.Invoke(Last);
+        Pub?.Invoke(this, new TValueEventArgs { Value = Last, IsNew = true });
         return Last;
     }
 

lib/trends/t3/T3.Tests.cs

@@ -173,7 +173,7 @@ public class T3Tests
 
     private class TestPublisher : ITValuePublisher
     {
-        public event Action<TValue>? Pub;
+        public event TValuePublishedHandler? Pub;
         public int SubscriberCount => Pub?.GetInvocationList().Length ?? 0;
     }
 
@@ -222,3 +222,4 @@ public class T3Tests
         Assert.Null(exception);
     }
 }
+

lib/trends/t3/T3.cs

@@ -27,11 +27,13 @@ namespace QuanTAlib;
 [SkipLocalsInit]
 public sealed class T3 : AbstractBase, IDisposable
 {
+    [StructLayout(LayoutKind.Auto)]
     private record struct State(double E1, double E2, double E3, double E4, double E5, double E6, bool IsInitialized)
     {
         public static State New() => new() { IsInitialized = false };
     }
 
+    [StructLayout(LayoutKind.Auto)]
     private readonly record struct Parameters(double Alpha, double C1, double C2, double C3, double C4);
 
     private readonly Parameters _params;
@@ -40,7 +42,7 @@ public sealed class T3 : AbstractBase, IDisposable
     private double _lastValidValue;
     private double _p_lastValidValue;
     private ITValuePublisher? _publisher;
-    private Action<TValue>? _handler;
+    private TValuePublishedHandler? _handler;
 
     /// <summary>
     /// Creates T3 with specified period and volume factor.
@@ -80,7 +82,7 @@ public sealed class T3 : AbstractBase, IDisposable
     public T3(ITValuePublisher source, int period, double vfactor = 0.7) : this(period, vfactor)
     {
         _publisher = source;
-        _handler = (item) => Update(item);
+        _handler = Handle;
         source.Pub += _handler;
     }
 
@@ -98,10 +100,12 @@ public sealed class T3 : AbstractBase, IDisposable
         {
             Last = new TValue(source.LastTime, Last.Value);
         }
-        _handler = (item) => Update(item);
+        _handler = Handle;
         _publisher.Pub += _handler;
     }
 
+    private void Handle(object? sender, TValueEventArgs e) => Update(e.Value, e.IsNew);
+
     /// <summary>
     /// True if the T3 has been initialized (received at least one value).
     /// </summary>
@@ -285,7 +289,7 @@ public sealed class T3 : AbstractBase, IDisposable
         if (period <= 0)
             throw new ArgumentException("Period must be greater than 0", nameof(period));
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
 
         double alpha = 2.0 / (period + 1);
         double v = vfactor;

lib/trends/tema/Tema.cs

@@ -26,6 +26,7 @@ namespace QuanTAlib;
 [SkipLocalsInit]
 public sealed class Tema : AbstractBase
 {
+    [StructLayout(LayoutKind.Auto)]
     private record struct EmaState(double Ema, double E, bool IsHot, bool IsCompensated)
     {
         public static EmaState New() => new() { Ema = 0, E = 1.0, IsHot = false, IsCompensated = false };
@@ -40,6 +41,7 @@ public sealed class Tema : AbstractBase
     private EmaState _p_state1 = EmaState.New();
     private EmaState _p_state2 = EmaState.New();
     private EmaState _p_state3 = EmaState.New();
+    private readonly TValuePublishedHandler _handler;
 
     private double _lastValidValue;
     private double _p_lastValidValue;
@@ -54,11 +56,12 @@ public sealed class Tema : AbstractBase
         _decay = 1.0 - _alpha;
         Name = $"Tema({period})";
         WarmupPeriod = period * 3;
+        _handler = Handle;
     }
 
     public Tema(ITValuePublisher source, int period) : this(period)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
     public Tema(TSeries source, int period) : this(period)
@@ -68,7 +71,7 @@ public sealed class Tema : AbstractBase
         {
             Last = new TValue(source.LastTime, Last.Value);
         }
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
     public Tema(double alpha)
@@ -79,8 +82,11 @@ public sealed class Tema : AbstractBase
         _decay = 1.0 - alpha;
         Name = $"Tema(α={alpha:F4})";
         WarmupPeriod = (int)(3 * (2.0 / alpha - 1.0));
+        _handler = Handle;
     }
 
+    private void Handle(object? sender, TValueEventArgs e) => Update(e.Value, e.IsNew);
+
     /// <summary>
     /// Initializes the indicator state using the provided history.
     /// </summary>
@@ -203,7 +209,7 @@ public sealed class Tema : AbstractBase
 
         double result = 3 * e1 - 3 * e2 + e3;
         Last = new TValue(input.Time, result);
-        PubEvent(Last);
+        PubEvent(Last, isNew);
         return Last;
     }
 
@@ -315,7 +321,7 @@ public sealed class Tema : AbstractBase
     public static void Batch(ReadOnlySpan<double> source, Span<double> output, double alpha)
     {
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
         if (alpha <= 0 || alpha >= 1)
             throw new ArgumentException("Alpha must be strictly between 0 and 1", nameof(alpha));
 

lib/trends/trima/Trima.cs

@@ -30,7 +30,7 @@ public sealed class Trima : AbstractBase, IDisposable
     private readonly int _period;
     private readonly Sma _sma1;
     private readonly Sma _sma2;
-    private readonly Action<TValue> _updateHandler;
+    private readonly TValuePublishedHandler _handler;
     private ITValuePublisher? _publisher;
 
     public Trima(int period)
@@ -43,7 +43,7 @@ public sealed class Trima : AbstractBase, IDisposable
 
         _sma1 = new Sma(p1);
         _sma2 = new Sma(p2);
-        _updateHandler = (item) => Update(item);
+        _handler = Handle;
 
         Name = $"Trima({period})";
         WarmupPeriod = p1 + p2 - 1;
@@ -52,14 +52,14 @@ public sealed class Trima : AbstractBase, IDisposable
     public Trima(ITValuePublisher source, int period) : this(period)
     {
         _publisher = source;
-        source.Pub += _updateHandler;
+        source.Pub += _handler;
     }
 
     public void Dispose()
     {
         if (_publisher != null)
         {
-            _publisher.Pub -= _updateHandler;
+            _publisher.Pub -= _handler;
             _publisher = null;
         }
     }
@@ -73,7 +73,7 @@ public sealed class Trima : AbstractBase, IDisposable
         TValue v2 = _sma2.Update(v1, isNew);
 
         Last = v2;
-        PubEvent(Last);
+        PubEvent(Last, isNew);
         return Last;
     }
 
@@ -99,6 +99,8 @@ public sealed class Trima : AbstractBase, IDisposable
         return new TSeries(t, v);
     }
 
+    private void Handle(object? sender, TValueEventArgs args) => Update(args.Value, args.IsNew);
+
     public override void Prime(ReadOnlySpan<double> source)
     {
         _sma1.Reset();
@@ -138,7 +140,7 @@ public sealed class Trima : AbstractBase, IDisposable
     public static void Batch(ReadOnlySpan<double> source, Span<double> output, int period)
     {
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
         if (period <= 0)
             throw new ArgumentException("Period must be greater than 0", nameof(period));
 

lib/trends/usf/Usf.cs

@@ -20,12 +20,14 @@ namespace QuanTAlib;
 [SkipLocalsInit]
 public sealed class Usf : AbstractBase
 {
+    [StructLayout(LayoutKind.Auto)]
     private record struct State(double Usf1, double Usf2, double PrevInput1, double PrevInput2, double LastValidValue, int Count, bool IsHot)
     {
         public static State New() => new() { Usf1 = 0, Usf2 = 0, PrevInput1 = 0, PrevInput2 = 0, LastValidValue = double.NaN, Count = 0, IsHot = false };
     }
 
     private readonly double _c1, _c2, _c3;
+    private readonly TValuePublishedHandler _handler;
     private State _state = State.New();
     private State _p_state = State.New();
 
@@ -48,6 +50,7 @@ public sealed class Usf : AbstractBase
 
         Name = $"Usf({period})";
         WarmupPeriod = period;
+        _handler = Handle;
     }
 
     /// <summary>
@@ -57,7 +60,7 @@ public sealed class Usf : AbstractBase
     /// <param name="period">Period for USF calculation</param>
     public Usf(ITValuePublisher source, int period) : this(period)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
     public Usf(TSeries source, int period) : this(period)
@@ -67,9 +70,11 @@ public sealed class Usf : AbstractBase
         {
             Last = new TValue(source.LastTime, Last.Value);
         }
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
+    private void Handle(object? sender, TValueEventArgs e) => Update(e.Value, e.IsNew);
+
     public override bool IsHot => _state.IsHot;
 
     public override void Prime(ReadOnlySpan<double> source)
@@ -171,7 +176,7 @@ public sealed class Usf : AbstractBase
             _state.IsHot = true;
 
         Last = new TValue(input.Time, usf);
-        PubEvent(Last);
+        PubEvent(Last, isNew);
         return Last;
     }
 
@@ -278,7 +283,7 @@ public sealed class Usf : AbstractBase
         double c1 = (1.0 + c2 - c3) / 4.0;
 
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
 
         if (source.Length == 0) return;
 

lib/trends/vidya/Vidya.Validation.Tests.cs

@@ -66,7 +66,7 @@ public class VidyaValidationTests
         _output.WriteLine("VIDYA Batch validated successfully against reference implementation");
     }
 
-    private static List<double> CalculateVidyaReference(TSeries data, int period)
+    private static IReadOnlyList<double> CalculateVidyaReference(TSeries data, int period)
     {
         var results = new List<double>();
         var prices = data.Select(x => x.Value).ToList();

lib/trends/vidya/Vidya.cs

@@ -33,8 +33,9 @@ public sealed class Vidya : AbstractBase, IDisposable
     private readonly RingBuffer _ups;
     private readonly RingBuffer _downs;
     private readonly ITValuePublisher? _source;
-    private readonly Action<TValue>? _pubHandler;
+    private readonly TValuePublishedHandler? _pubHandler;
 
+    [StructLayout(LayoutKind.Auto)]
     private record struct State(
         double PrevClose, double LastVidya,
         double CurrentClose, double CurrentVidya,
@@ -59,7 +60,7 @@ public sealed class Vidya : AbstractBase, IDisposable
     public Vidya(ITValuePublisher source, int period) : this(period)
     {
         _source = source;
-        _pubHandler = (item) => Update(item);
+        _pubHandler = Handle;
         source.Pub += _pubHandler;
     }
 
@@ -71,6 +72,8 @@ public sealed class Vidya : AbstractBase, IDisposable
         }
     }
 
+    private void Handle(object? sender, TValueEventArgs e) => Update(e.Value, e.IsNew);
+
     public override bool IsHot => _state.BarCount >= _period;
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -277,7 +280,7 @@ public sealed class Vidya : AbstractBase, IDisposable
         if (period <= 0)
             throw new ArgumentException("Period must be greater than 0", nameof(period));
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
 
         if (source.Length == 0) return;
 

lib/trends/wma/Wma.cs

@@ -33,8 +33,9 @@ public sealed class Wma : AbstractBase, IDisposable
     private readonly double _divisor;
     private readonly RingBuffer _buffer;
     private readonly ITValuePublisher? _source;
-    private readonly Action<TValue>? _handler;
+    private readonly TValuePublishedHandler? _handler;
 
+    [StructLayout(LayoutKind.Auto)]
     private record struct State(double Sum, double WSum, double LastInput, double LastValidValue, int TickCount, bool HasSeenValidData);
     private State _state;
     private State _p_state;
@@ -68,7 +69,7 @@ public sealed class Wma : AbstractBase, IDisposable
     public Wma(ITValuePublisher source, int period) : this(period)
     {
         _source = source;
-        _handler = (item) => Update(item);
+        _handler = Handle;
         source.Pub += _handler;
     }
 
@@ -159,7 +160,7 @@ public sealed class Wma : AbstractBase, IDisposable
 
         double currentDivisor = _buffer.IsFull ? _divisor : (double)_buffer.Count * (_buffer.Count + 1) * 0.5;
         Last = new TValue(input.Time, _state.WSum / currentDivisor);
-        PubEvent(Last);
+        PubEvent(Last, isNew);
         return Last;
     }
 
@@ -185,6 +186,8 @@ public sealed class Wma : AbstractBase, IDisposable
         return new TSeries(t, v);
     }
 
+    private void Handle(object? sender, TValueEventArgs e) => Update(e.Value, e.IsNew);
+
     public override void Prime(ReadOnlySpan<double> source)
     {
         if (source.Length == 0) return;
@@ -248,7 +251,7 @@ public sealed class Wma : AbstractBase, IDisposable
     public static void Batch(ReadOnlySpan<double> source, Span<double> output, int period)
     {
         if (source.Length != output.Length)
-            throw new ArgumentException("Source and output must have the same length");
+            throw new ArgumentException("Source and output must have the same length", nameof(output));
         if (period <= 0)
             throw new ArgumentException("Period must be greater than 0", nameof(period));
 

lib/volatility/atr/Atr.cs

@@ -21,6 +21,7 @@ namespace QuanTAlib;
 public sealed class Atr : AbstractBase
 {
     private readonly Rma _rma;
+    private readonly TValuePublishedHandler _handler;
     private TBar _prevBar;
     private bool _isInitialized;
 
@@ -37,6 +38,7 @@ public sealed class Atr : AbstractBase
         Name = $"Atr({period})";
         WarmupPeriod = period;
         _isInitialized = false;
+        _handler = Handle;
     }
 
     /// <summary>
@@ -46,7 +48,7 @@ public sealed class Atr : AbstractBase
     /// <param name="period">Period for ATR calculation</param>
     public Atr(ITValuePublisher source, int period) : this(period)
     {
-        source.Pub += (item) => Update(item);
+        source.Pub += _handler;
     }
 
     /// <summary>
@@ -62,6 +64,8 @@ public sealed class Atr : AbstractBase
         // but we can rely on manual updates or the user subscribing.
     }
 
+    private void Handle(object? sender, TValueEventArgs e) => Update(e.Value, e.IsNew);
+
     /// <summary>
     /// True if the ATR has warmed up and is providing valid results.
     /// </summary>
@@ -119,7 +123,7 @@ public sealed class Atr : AbstractBase
         TValue result = _rma.Update(new TValue(input.Time, tr), isNew);
 
         Last = result;
-        PubEvent(Last);
+        PubEvent(Last, isNew);
         return result;
     }
 
@@ -132,7 +136,7 @@ public sealed class Atr : AbstractBase
         // If user passes a single value, we assume it IS the True Range
         TValue result = _rma.Update(input, isNew);
         Last = result;
-        PubEvent(Last);
+        PubEvent(Last, isNew);
         return result;
     }
 

lib/volume/adl/Adl.Tests.cs

@@ -103,8 +103,8 @@ public class AdlTests
     {
         var adl = new Adl();
         bool eventFired = false;
-        adl.Pub += (val) => eventFired = true;
-        
+        adl.Pub += (object? sender, TValueEventArgs args) => eventFired = true;
+
         adl.Update(new TBar(DateTime.UtcNow, 10, 12, 8, 10, 100));
         Assert.True(eventFired);
     }

lib/volume/adl/Adl.cs

@@ -33,7 +33,7 @@ public sealed class Adl : ITValuePublisher
     /// </summary>
     public static string Name => "ADL";
 
-    public event Action<TValue>? Pub;
+    public event TValuePublishedHandler? Pub;
 
     /// <summary>
     /// Current ADL value.
@@ -90,7 +90,7 @@ public sealed class Adl : ITValuePublisher
 
         _isInitialized = true;
         Last = new TValue(input.Time, _adl);
-        Pub?.Invoke(Last);
+        Pub?.Invoke(this, new TValueEventArgs { Value = Last, IsNew = true });
         return Last;
     }
 
@@ -106,7 +106,7 @@ public sealed class Adl : ITValuePublisher
         }
 
         Last = new TValue(input.Time, _adl);
-        Pub?.Invoke(Last);
+        Pub?.Invoke(this, new TValueEventArgs { Value = Last, IsNew = true });
         return Last;
     }
 
@@ -143,7 +143,7 @@ public sealed class Adl : ITValuePublisher
     public static void Calculate(ReadOnlySpan<double> high, ReadOnlySpan<double> low, ReadOnlySpan<double> close, ReadOnlySpan<double> volume, Span<double> output)
     {
         if (high.Length != low.Length || high.Length != close.Length || high.Length != volume.Length || high.Length != output.Length)
-            throw new ArgumentException("All spans must be of the same length");
+            throw new ArgumentException("All spans must be of the same length", nameof(output));
 
         int len = high.Length;
         int i = 0;
@@ -197,3 +197,4 @@ public sealed class Adl : ITValuePublisher
         }
     }
 }
+

lib/volume/adosc/Adosc.cs

@@ -32,7 +32,7 @@ public sealed class Adosc : ITValuePublisher
     /// </summary>
     public string Name { get; }
 
-    public event Action<TValue>? Pub;
+    public event TValuePublishedHandler? Pub;
 
     /// <summary>
     /// Current ADOSC value.
@@ -96,7 +96,7 @@ public sealed class Adosc : ITValuePublisher
 
         double adosc = eFast.Value - eSlow.Value;
         Last = new TValue(input.Time, adosc);
-        Pub?.Invoke(Last);
+        Pub?.Invoke(this, new TValueEventArgs { Value = Last, IsNew = true });
         return Last;
     }
 
@@ -162,7 +162,7 @@ public sealed class Adosc : ITValuePublisher
     public static void Calculate(ReadOnlySpan<double> high, ReadOnlySpan<double> low, ReadOnlySpan<double> close, ReadOnlySpan<double> volume, Span<double> output, int fastPeriod = 3, int slowPeriod = 10)
     {
         if (high.Length != output.Length)
-            throw new ArgumentException("Source and output spans must be of the same length.");
+            throw new ArgumentException("Source and output spans must be of the same length.", nameof(output));
 
         Span<double> adl = high.Length <= 1024 ? stackalloc double[high.Length] : new double[high.Length];
         Adl.Calculate(high, low, close, volume, adl);
@@ -176,3 +176,4 @@ public sealed class Adosc : ITValuePublisher
         SimdExtensions.Subtract(fastEma, slowEma, output);
     }
 }
+

qodana.yaml

@@ -1,115 +1,58 @@
- #-------------------------------------------------------------------------------#
+#-------------------------------------------------------------------------------#
 #               Qodana analysis is configured by qodana.yaml file               #
 #             https://www.jetbrains.com/help/qodana/qodana-yaml.html            #
 #-------------------------------------------------------------------------------#
 version: "1.0"
-
-#Specify inspection profile for code analysis
 profile:
-  name: qodana.starter
+  name: qodana.recommended
 
-#Enable inspections
-#include:
-#  - name: <SomeEnabledInspectionId>
-
-#Disable inspections
-exclude:
-  # Disable XML documentation comment validation (allows unescaped < > in comments)
-  - name: XmlDocAnalyzer
-  - name: InvalidXmlDocComment
-  # Library project - public API properties are intentionally unused internally
-  - name: UnusedAutoPropertyAccessor.Global
-  # Style preference - fully qualified names used intentionally for clarity
-  - name: RedundantNameQualifier
-  - name: RCS1036  # Roslyn: Remove redundant empty line
-  - name: IDE0001  # Simplify name
-  - name: IDE0002  # Simplify member access
-
-  # HIGH-PERFORMANCE LIBRARY EXCLUSIONS
-  # ------------------------------------
-  # Flat namespace structure is intentional for this library
-  - name: CheckNamespace
-
-  # Float comparisons are intentional in financial calculations (checking 0.0, NaN, sentinel values)
-  - name: CompareOfFloatsByEqualityOperator
-
-  # Explicit default args improve code clarity and self-documentation
-  - name: RedundantArgumentDefaultValue
-
-  # Platform-specific optimizations (SIMD, intrinsics) are intentional
-  - name: CA1416  # Validate platform compatibility
-
-  # Public API unused internally - this is a library
-  - name: UnusedMember.Global
-  - name: MemberCanBePrivate.Global
-  - name: MemberCanBePrivate.Local
-  - name: ClassNeverInstantiated.Global
-  - name: UnusedType.Global
-  - name: UnusedMethodReturnValue.Global
-  - name: AutoPropertyCanBeMadeGetOnly.Global
-  - name: MemberCanBeMadeStatic.Global
-  - name: MemberCanBeMadeStatic.Local
-
-  # Redundant using directives - managed by IDE/build, not critical for library
-  - name: RedundantUsingDirective
-  - name: IDE0005  # Remove unnecessary using directives
-  - name: CS8019  # Unnecessary using directive
-
-  # Nullable warning suppressions - used intentionally for null safety patterns
-  - name: RedundantSuppressNullableWarningExpression
-
-  # Redundant type specifications - explicit types used for clarity/documentation
-  - name: RedundantTypeArgumentsOfMethod
-  - name: RedundantCast
-  - name: RedundantExplicitArrayCreation
-
-  # Unused local variables - often used in test setup or placeholder code (includes false positives for tuple deconstruction)
-  - name: UnusedVariable
-  - name: UnusedVariable.Compiler  # False positive for tuple deconstruction
-  - name: CS0219  # Variable is assigned but never used
-  - name: RedundantAssignment # Value assigned is not used in any execution path
-  - name: UnusedAssignment # Assignment is not used
-  - name: IDE0059 # Unnecessary assignment of a value
-
-  # Object initializer in using statement - false positive for simple property setters
-  - name: CA2000  # Dispose objects before losing scope (overly cautious for simple cases)
-  - name: UseObjectOrCollectionInitializerWhenPossible
-  - name: DoNotUseObjectInitializerForUsingVariable
-  - name: ObjectInitializerMightCauseException
-  - name: ObjectCreationAsStatement
-  - name: UseObjectOrCollectionInitializer
-  - name: UsingStatementResourceInitialization  # "Do not use object initializer for 'using' variable"
-
-  # Private field can be local variable - test fixtures often use fields for clarity/organization
-  - name: PrivateFieldCanBeConvertedToLocalVariable
-  - name: ConvertToLocalFunction
-
-  # Code coverage checks - SonarCloud handles coverage, Qodana coverage unreliable
-  - name: CoverageCheck
-  - name: ClassCoverageCheck
-  - name: MethodCoverageCheck
-  - name: CodeCoverageCheck
-
-  # Library-specific exclusions
-  - name: UnusedMember.Global # Suppresses "Method/Class is never used"
-  - name: UnusedMethodReturnValue.Global # Suppresses "Return value is never used"
-  - name: AutoPropertyCanBeMadeGetOnly.Global # Optional: common in libraries
-
-#Execute shell command before Qodana execution (Applied in CI/CD pipeline)
-bootstrap: sh ./.github/prepare-qodana.sh
-
-#Install IDE plugins before Qodana execution (Applied in CI/CD pipeline)
-#plugins:
-#  - id: <plugin.id> #(plugin id can be found at https://plugins.jetbrains.com)
-
-#Specify Qodana linter for analysis (Applied in CI/CD pipeline)
-#linter: jetbrains/qodana-dotnet:2025.3
-
-linter: jetbrains/qodana-dotnet:2024.3
+linter: jetbrains/qodana-dotnet:2025.3
 
 dotnet:
   solution: QuanTAlib.sln
-  coverage:
-    pathMappings:
-      - from: /home/runner/work/QuanTAlib/QuanTAlib
-        to: /data/project
+  frameworks: "net10.0"
+  configuration: Release
+
+failureConditions:
+  severityThresholds:
+    critical: 0
+    high: 10
+    moderate: 50
+    low: 100
+    info: -1
+
+exclude:
+  - name: All
+    paths:
+      - "**/bin/**"
+      - "**/obj/**"
+      - "**/packages/**"
+      - "**/TestResults/**"
+      - "**/.vs/**"
+      - "**/.vscode/**"
+      - "**/.idea/**"
+      - "**/.git/**"
+      - ".github/**"
+      - "**/.github/**"
+      - ".github/TradingPlatform.BusinessLayer.xml"
+      - "**/TradingPlatform.BusinessLayer.xml"
+      - "**/.agent/**"
+      - "**/.codacy/**"
+      - "**/.config/**"
+      - "**/.clinerules/**"
+      - "**/.idea/**"
+      - "**/.qodana/**"
+      - "**/.sonarlint/**"
+      - "**/coverage/**"
+      - "**/CoverageReport/**"
+      - "**/archive/**"
+      - "**/notebooks/**"
+      - "**/*.Designer.cs"
+      - "**/*.generated.cs"
+      - "**/results/**"
+      - "**/TestResults/**"
+      - "**/BenchmarkDotNet.Artifacts/**"
+  - name: InvalidXmlDocComment
+  - name: EnforceIfStatementBraces
+  - name: CheckNamespace
+  - name: LoopCanBeConvertedToQuery

quantower/IndicatorExtensions.Tests.cs

@@ -149,7 +149,7 @@ public class IndicatorExtensionsTests
         var args = new PaintChartEventArgs(graphics, new Rectangle(0, 0, 100, 100));
 
         // Test PaintSmoothCurve with different LineStyles and Warmup
-        foreach (LineStyle style in Enum.GetValues(typeof(LineStyle)))
+        foreach (LineStyle style in Enum.GetValues<LineStyle>())
         {
             var series = new LineSeries("Test", Color.Blue, 1, style);
             for (int i = 0; i < 20; i++) series.AddValue();