macos

Extract internal part as the function `str_chilled_p` #471

Job	Run time
ruby-versions / Generate Ruby versions	2s
macos-13 2.7	53s
macos-13 3.0	26s
macos-13 3.1	26s
macos-13 3.2	24s
macos-13 3.3	30s
macos-13 3.4	21s
macos-13 debug	29s
macos-13 head	29s
macos-14 2.7	28s
macos-14 3.0	20s
macos-14 3.1	13s
macos-14 3.2	17s
macos-14 3.3	14s
macos-14 3.4	16s
macos-14 debug	22s
macos-14 head	21s
	6m 31s

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