Fix sendspin serve crash on Python 3.12#252
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Pull request overview
Fixes an import-time crash of sendspin serve on Python 3.12 caused by subscripting multiprocessing.sharedctypes.Synchronized in a type annotation (which only becomes subscriptable in Python 3.13+).
Changes:
- Enables postponed evaluation of annotations in the embedded server module by adding
from __future__ import annotations.
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sendspin serveraisedTypeError: type 'Synchronized' is not subscriptableat import time on Python 3.12 becausemultiprocessing.sharedctypes.Synchronized[int]only gained__class_getitem__in 3.13.