Currently scalar types in the MapBinder are restricted to a very limited set. We could also allow custom types to be supported, perhaps via a @ScalarValue annotation on the bound class.
Comment From: philwebb
We might want to fix #14796 first so that IDEs work.
Comment From: davoudsa
Can you provide more information that which project this is related to? Would like to investigate and work on this enhancement
Comment From: snicoll
@davoudsa thanks for the offer but we can't guide you at this point as we need to investigate the problem a little more. I have added a label accordingly.