Keyword mapping refactoring

Src/AST/Myc.Ast.Evaluator.pas

@@ -78,8 +78,7 @@ uses
     Myc.Data.Decimal,
     Myc.Data.Series,
     Myc.Data.Scalar.JSON,
-    Myc.Ast.Types,
-    Myc.Data.Records;
+    Myc.Ast.Types;
 
 // Helper type for TCO via trampolining.
 type
@@ -499,8 +498,7 @@ begin
             genFields[i] := TPair<IKeyword, TDataValue>.Create(field.Key.Value, field.Value.Accept(Self));
         end;
 
-        var dynRec := TDynamicRecord.Create(genFields);
-        Result := TDataValue.FromGenericRecord(dynRec);
+        Result := TDataValue.FromGenericRecord(TKeywordMapping<TDataValue>.Create(genFields));
     end
     else if Assigned(Node.ScalarDefinition) then
     begin