feat: add new indicators (Decay, Edecay, MinusDi, MinusDm, PlusDi, PlusDm, Maxindex, Minindex, Sarext) and update pine scripts, core libs, validation tests, and python bindings

lib/core/ringbuffer/RingBuffer.Tests.cs

@@ -12,7 +12,7 @@ public class RingBufferTests
         Assert.Equal(0, buffer.Count);
         Assert.False(buffer.IsFull);
         Assert.Equal(0, buffer.Sum);
-        Assert.Equal(0, buffer.Average);
+        Assert.True(double.IsNaN(buffer.Average));
     }
 
     [Fact]
@@ -192,7 +192,7 @@ public class RingBufferTests
 
         Assert.Equal(0, buffer.Count);
         Assert.Equal(0, buffer.Sum);
-        Assert.Equal(0, buffer.Average);
+        Assert.True(double.IsNaN(buffer.Average));
         Assert.False(buffer.IsFull);
     }
 
@@ -453,11 +453,11 @@ public class RingBufferTests
     }
 
     [Fact]
-    public void Average_EmptyBuffer_ReturnsZero()
+    public void Average_EmptyBuffer_ReturnsNaN()
     {
         var buffer = new RingBuffer(5);
 
-        Assert.Equal(0, buffer.Average);
+        Assert.True(double.IsNaN(buffer.Average));
     }
 
     [Fact]

lib/core/ringbuffer/RingBuffer.cs

@@ -141,12 +141,12 @@ public sealed class RingBuffer : IEnumerable<double>
 
     /// <summary>
     /// Average of all elements in the buffer.
-    /// Returns 0 if buffer is empty.
+    /// Returns <see langword="double.NaN"/> if buffer is empty.
     /// </summary>
     public double Average
     {
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        get => _count > 0 ? _sum / _count : 0;
+        get => _count > 0 ? _sum / _count : double.NaN;
     }
 
     /// <summary>