At present, typedGetoptions does not mention which condition failed the argument processing and return the whole error message. It would be great to have typedGetoptions return the condition which failed.
How can I submit my code implementing this request?
SourceForge should allow you to "attach" files to this report. Such a file can be a "patch" showing the difference between old and new code, or it could be the the whole new code.
Look for the text "Add a file" on the bug page. As you are the creator of the report you should be able to see this when you are logged in. It is a button you can click on and then enter the path to the file for upload.
Attached file has code changes for this feature request and #3584575. It supports must,file,dir type commandline parameters.