Structuring typing.NewType classes

[Savlik]

• cattrs version: 1.8.0
• Python version: 3.8.10
• Operating System: Linux

Description

I want to use typing.NewType in my code, but structuring these variables throws an exception.

What I Did

from typing import  NewType
from cattr import GenConverter

c = GenConverter()

MyType = NewType("MyType", str)
initial = MyType("test")

raw = c.unstructure(initial, MyType)
new = c.structure(raw, MyType)
assert initial == new

Traceback (most recent call last):
  File ".../test.py", line 10, in <module>
    new = c.structure(raw, MyType)
  File ".../lib/python3.8/site-packages/cattr/converters.py", line 294, in structure
    return self._structure_func.dispatch(cl)(obj, cl)
  File ".../lib/python3.8/site-packages/cattr/converters.py", line 360, in _structure_error
    raise StructureHandlerNotFoundError(msg, type_=cl)
cattr.errors.StructureHandlerNotFoundError: Unsupported type: <function NewType.<locals>.new_type at 0x7fb67c77a0d0>. Register a structure hook for it.

Of course, I can explicitly register structure hook for it, but it would be nice if it worked out of the box, if possible.

[Tinche]

Dupe of #94 ? Might look into this soon though.