Pipes refactoring, Fixes in type checker

Src/Data/Myc.Data.Scalar.pas

@@ -92,6 +92,7 @@ type
         class operator Implicit(const A: TScalar): Int64; overload; inline;
         class operator Implicit(const A: TScalar): Boolean; overload; inline;
         class operator Implicit(const A: TScalar): TDateTime; overload; inline;
+        class operator Implicit(const A: TScalar): IKeyword; overload; inline;
 
         class function StringToKind(const AName: string): TKind; static;
         function ToString: String;
@@ -750,6 +751,15 @@ begin
         raise EArgumentException.Create('Operator "xor" requires Ordinal or Boolean arguments.');
 end;
 
+class operator TScalar.Implicit(const A: TScalar): IKeyword;
+begin
+    case A.Kind of
+        TKind.Keyword: Result := TKeywordRegistry.GetKeyword(A.Value.AsInt64);
+    else
+        raise EInvalidCast.CreateFmt('Cannot implicitly convert %s to Keyword', [A.Kind.ToString]);
+    end;
+end;
+
 class operator TScalar.LeftShift(const A, B: TScalar): TScalar;
 begin
     if (A.Kind <> TKind.Ordinal) or (B.Kind <> TKind.Ordinal) then