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Antoine PitrouGitHub
9b584547c76
Antoine Pitrou authored and GitHub committed 1f247990832
GH-43487: [Python] Sanitize Python reference handling in UDF implementation (#43557)

1. Remove spurious increfs (the function object is already incref'ed at an upper level)
2. Add unit test with an ephemeral Python function object
3. Streamline and improve Python reference handling

* GitHub Issue: #43487

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Antoine Pitrou <antoine@python.org>