macos

Allow seek when underlying string is frozen (#121) #430

Job	Run time
ruby-versions / Generate Ruby versions	2s
macos-13 2.7	56s
macos-13 3.0	22s
macos-13 3.1	15s
macos-13 3.2	28s
macos-13 3.3	19s
macos-13 3.4	19s
macos-13 debug	25s
macos-13 head	20s
macos-14 2.7	34s
macos-14 3.0	17s
macos-14 3.1	11s
macos-14 3.2	21s
macos-14 3.3	12s
macos-14 3.4	14s
macos-14 debug	17s
macos-14 head	14s
	5m 46s

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