PEP 803: Stable ABI for Free-Threaded Builds

[encukou (Petr Viktorin)]

@encukou

Alright, that sounds like a good reason for an abi3t ABI tag.

I guess that would also make things less confusing for users – make it clearer that we will have this:

@Monarch

Ideally, I’d like to see:

• abi3 continues to provide forward compatibility with non-free-threaded Python
• abi4 introduced to cover both free-threaded and GIL-enabled builds, with the same forward compatibility guarantee

except it’d be abi3.abi3t instead of abi4 – even explicitly compatible with both the regular ol’ builds and the t ones.