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gh-76535: Add unstable C APIs for lower/upper/title/casefold #237351

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gh-76535: Add unstable C APIs for lower/upper/title/casefold

gh-76535: Add unstable C APIs for lower/upper/title/casefold #237351

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Job	Run time
Unresolved review	7s
DO-NOT-MERGE	6s
	13s

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