[issue45439] [C API] Move usage of tp_vectorcall_offset from public headers to the internal C API

[STINNER Victor]

Change by STINNER Victor <vstinner at python.org>:


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keywords: +patch
pull_requests: +27185
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/28890

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45439>
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