Python 3.14 annotations support fix

[manzt]

Original patch in jcrist#852.

[ionelmc]

@manzt I would like to suggest that renaming everything to msgspec_m seems counterproductive if the goal of this fork is to be a drop-in, bugfix-only project. Unless you want to do more than just bugfixes. If there's a choice to add from __future__ import annotations all over the place or replace all the imports in one's project I think people will find the former simpler.

[manzt]

@ionelmc thanks for the suggestion. I've made #7 reverting the rename (and providing some rationale for why I chose to rename in the first place).

[ionelmc]

I kinda understand where that is coming from - I guess you have a dependency that depends on msgspec, and your main project or other deps want to depend on msgspec-m. Sadly there's no pretty solution, and Obsoletes-Dist/Provides-Dist metadata is not supported in any tool (https://packaging.python.org/en/latest/specifications/core-metadata/#obsoletes-dist-multiple-use) but having msgspec and msgspec_m trying to interoperate in a single codebase ain't it (is it even possible? wouldn't all the utilities be broken).

The way I see it the path of least friction is to just get dependencies to also depend on msgspec-m.

[ofek]

I became a co-maintainer and will try to merge everything that is required for supporting 3.14 in the next few days.

[manzt]

fantastic news, thank you for shepherding @ofek