Type | None or Optional[Type] don't work when default value is None

[dave-epstein]

The parser throws an invalid value error if you try to set a dataclass attribute e.g. of type int | None to an int when the default value in the dataclass definition is None.

[lebrice]

Hey there @dave-epstein , sorry for the SUPER late reply.

Is this still an issue? (I'm thinking that #323 might have fixed this perhaps?)