Add Python 3.14 support, experimental subinterpreter/freethreading support #1279
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The bulk of the changes here is a rewrite of
recordobj.c
to use modernCPython API to properly isolate the module (PEP 489, PEP 573, PEP 630).
This, along with Cython flags, enables support for safely importing
asyncpg
in subinterpreters. TheRecord
freelist is nowthread-specific, so asyncpg should be thread-safe at the C level.
Support for subinterpreters and freethreading is EXPERIMENTAL.