Shared series in Pipes

Src/Data/Myc.Data.Value.pas

@@ -98,6 +98,8 @@ type
 
         class function Map(const SourceSeries: ISeries; const MapperFunc: TFunc): ISeries; static;
 
+        procedure SetVoid;
+
         // --- Existing Accessors ---
         function AsScalar: TScalar; inline;
         function AsMethod: TFunc; inline;
@@ -377,6 +379,12 @@ begin
     Result := ITuple<TDataValue>(FInterface);
 end;
 
+procedure TDataValue.SetVoid;
+begin
+    FInterface := nil;
+    FKind := vkVoid;
+end;
+
 function TDataValue.ToString: String;
 var
     sb: TStringBuilder;