[issue46481] Implement vectorcall protocol for weakref_call()

[Dong-hee Na]

Change by Dong-hee Na <donghee.na at python.org>:


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keywords: +patch
pull_requests: +29007
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/30820

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<https://bugs.python.org/issue46481>
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