For some reasons I don't really understand sometimes this causes an exception, sometimes it does not. Anyway, issubclass only access class objects as first argument so when the "validate" field is just defined as a function an error is raised. Using inspect to check that the passed value is actually a class should fix the issue (this was already employed in prompts/input.py).
CITGuru
commented
5 years ago
For some reasons I don't really understand sometimes this causes an exception, sometimes it does not. Anyway,
issubclassonly access class objects as first argument so when the "validate" field is just defined as a function an error is raised. Usinginspectto check that the passed value is actually a class should fix the issue (this was already employed inprompts/input.py).