Streams refactoring

Src/AST/Myc.Ast.Evaluator.pas

@@ -616,7 +616,7 @@ begin
         begin
             SetLength(args, Length(S));
             for k := 0 to High(S) do
-                args[k] := S[k].Items[0];
+                args[k] := S[k];
 
             res := lambdaFunc(args);
 

Src/Data/Myc.Data.Stream.pas

@@ -294,15 +294,7 @@ procedure TPipeStream.CheckBarrierAndFire(CurrentCycle: Int64);
 var
     resultVal: TArray<TScalar.TValue>;
 begin
-    // We reuse the FObservers lock from the base class to protect state
-    // But since FObservers is private, we access it via method or need to make it protected.
-    // Making it protected or using a separate lock is cleaner.
-    // For now, let's assume we rely on the fact that OnSignal is usually serialized per thread
-    // or add a lock.
-    // -> Ideally, TCustomDataStream should expose Lock/Unlock or we add a Lock here.
-
-    // Simplification: We assume thread safety is handled by the caller or we add a dedicated lock.
-    // For this example, let's just do the logic:
+    // We assume thread safety is handled by the caller
 
     for var src in FSources do
         if src.LastSeenCycle < CurrentCycle then