normalization of methods

lib/trends_FIR/wma/Wma.cs

@@ -24,6 +24,7 @@ public sealed class Wma : AbstractBase
     private readonly RingBuffer _buffer;
     private readonly ITValuePublisher? _source;
     private readonly TValuePublishedHandler? _handler;
+    private bool _disposed;
 
     [StructLayout(LayoutKind.Auto)]
     private record struct State(double Sum, double WSum, double LastInput, double LastValidValue, int TickCount, bool HasSeenValidData);
@@ -68,9 +69,13 @@ public sealed class Wma : AbstractBase
 
     protected override void Dispose(bool disposing)
     {
-        if (_source != null && _handler != null)
+        if (!_disposed)
         {
-            _source.Pub -= _handler;
+            if (disposing && _source != null && _handler != null)
+            {
+                _source.Pub -= _handler;
+            }
+            _disposed = true;
         }
         base.Dispose(disposing);
     }
@@ -298,6 +303,13 @@ public sealed class Wma : AbstractBase
         CalculateScalarCore(source, output, period);
     }
 
+    public static (TSeries Results, Wma Indicator) Calculate(TSeries source, int period)
+    {
+        var indicator = new Wma(period);
+        TSeries results = indicator.Update(source);
+        return (results, indicator);
+    }
+
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     private static void CalculateScalarCore(ReadOnlySpan<double> source, Span<double> output, int period)
     {
@@ -856,4 +868,4 @@ public sealed class Wma : AbstractBase
             Unsafe.Add(ref outRef, idx) = wsum * invDivisor;
         }
     }
-}
+}