Jsons

- Bugfix: a string was sometimes unintentionally parsed into a datetime.

- Bugfix: `fork_inst`s were not propagated in `default_list_deserializer` (thanks to patrickguenther).

- Bugfix: Loading dicts with hashed keys could cause an error due to being loaded twice (thanks to georgeharker).
- Bugfix: IntEnums were not serialized with their names when `use_enum_name=True` (thanks to georgeharker).
- Bugfix: Named tuples did not use `typing.get_type_hints` for getting the types, causing trouble in future annotations (thanks to georgeharker).

* Feature: Support for Python3.10.
* Feature: Support for attrs.

- Bugfix: `ZoneInfo` failed to dump if attached to a `datetime`.

- Feature: Support for `ZoneInfo` on Python3.9+.
- Change: microseconds are no longer stripped by default (thanks to pietrodn).