macos

Use proper type for checkEncoding #441

Job	Run time
ruby-versions / Generate Ruby versions	4s
macos-13 2.7	52s
macos-13 3.0	20s
macos-13 3.1	24s
macos-13 3.2	18s
macos-13 3.3	25s
macos-13 3.4	22s
macos-13 debug	36s
macos-13 head	21s
macos-14 2.7	25s
macos-14 3.0	11s
macos-14 3.1	11s
macos-14 3.2	13s
macos-14 3.3	13s
macos-14 3.4	13s
macos-14 debug	18s
macos-14 head	14s
	5m 40s

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