GH-104584: Fix refleak when tracing through calls#110593
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brandtbucher added type-bug 
brandtbucher changed the title 
gvanrossum approved these changes Oct 10, 2023
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(I love how this already violates a likely future C API requirement. Glad that those requirements don't apply to internal APIs. :-)
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This modifies
_PyFunction_LookupByVersionto return a borrowed reference, which is what the caller assumes (and most internal "lookup" functions do, in general).