REF (string): de-duplicate str_map_nan_semantics #18099

Job	Run time
Linux-32-bit	19m 25s
Linux-Musl	17m 37s
Pyodide build	25m 31s
python-freethreading	23m 15s
python-dev (macOS-13)	26m 41s
python-dev (macOS-14)	14m 58s
python-dev (ubuntu-22.04)	25m 12s
python-dev (windows-latest)	27m 44s
macos-13 actions-310.yaml	24m 9s
macos-13 actions-311.yaml	27m 55s
macos-13 actions-312.yaml	27m 54s
macos-14 actions-310.yaml	16m 40s
macos-14 actions-311.yaml	16m 13s
macos-14 actions-312.yaml	17m 43s
windows-latest actions-311.yaml	40m 24s
windows-latest actions-312.yaml	47m 18s
windows-latest actions-310.yaml	33m 50s
ubuntu-latest actions-310.yaml	45m 11s
Minimum Versions	23m 54s
ubuntu-latest actions-311.yaml	42m 22s
Future infer strings (without pyarrow)	42m 48s
Locale: zh_CN	24m 41s
Locale: it_IT	25m 46s
Downstream Compat	6m 1s
Numpy Dev	17m 9s
Pyarrow Nightly	18m 55s
ubuntu-latest actions-312.yaml	43m 58s
Future infer strings	52m 44s
Pypy	1m 12s
	12h 57m 10s

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