Extended data value type descriptions

Src/Data/Myc.Data.Value.pas

@@ -210,18 +210,75 @@ begin
 end;
 
 function TDataValue.ToString: String;
+var
+    sb: TStringBuilder;
+    field: TScalarRecordField;
+    first: Boolean;
 begin
     case FKind of
         vkScalar: Result := FScalar.ToString;
         vkInterface: Result := '<interface>';
-        vkText: Result := AsText;
-        vkSeries: Result := '<series>';
-        vkRecordSeries: Result := '<record_series>';
-        vkRecord: Result := '<record>';
-        vkMemberSeries: Result := '<member_series>';
+        vkText: Result := '"' + AsText + '"';
+        vkSeries:
+        begin
+            var series := AsSeries.Value;
+            // Add type and count for series
+            Result := Format('<series<%s>[%d]>', [series.Kind.ToString, series.Items.Count]);
+        end;
+        vkRecordSeries:
+        begin
+            var series := AsRecordSeries.Value;
+            sb := TStringBuilder.Create;
+            try
+                sb.Append('{');
+                first := True;
+                for field in series.Def.Fields do
+                begin
+                    if not first then
+                        sb.Append(',');
+                    sb.Append(field.Name);
+                    first := False;
+                end;
+                sb.Append('}');
+                // Add field names and count for record series
+                Result := Format('<record_series%s[%d]>', [sb.ToString, series.Count]);
+            finally
+                sb.Free;
+            end;
+        end;
+        vkRecord:
+        begin
+            var rec := AsRecord.Value;
+            sb := TStringBuilder.Create;
+            try
+                sb.Append('{');
+                first := True;
+                for field in rec.Def.Fields do
+                begin
+                    if not first then
+                        sb.Append(',');
+                    sb.Append(field.Name);
+                    first := False;
+                end;
+                sb.Append('}');
+                // Add field names for records
+                Result := Format('<record%s>', [sb.ToString]);
+            finally
+                sb.Free;
+            end;
+        end;
+        vkMemberSeries:
+        begin
+            var series := AsMemberSeries.Value;
+            // Add type and count for member series
+            Result := Format('<member_series<%s>[%d]>', [series.Kind.ToString, series.Count]);
+        end;
         vkVoid: Result := '<void>';
         vkMethod: Result := '<method>';
-        vkGeneric: Result := '<generic>';
+        vkGeneric:
+            // Getting meaningful type information for vkGeneric is not easily possible
+            // without storing additional RTTI, as the specific type of T in TVal<T> is lost.
+            Result := '<generic>';
     else
         Result := '[Unknown DataValue]';
     end;