macos

Fix SEGV at eof? on null StringIO #477

Job	Run time
ruby-versions / Generate Ruby versions	4s
macos-13 2.7	1m 2s
macos-13 3.4	22s
macos-13 debug	38s
macos-13 3.2	21s
macos-13 3.0	47s
macos-13 3.3	19s
macos-14 3.1	14s
macos-13 3.1	19s
macos-14 3.0	16s
macos-14 3.2	14s
macos-13 head	22s
macos-14 debug	18s
macos-14 3.3	14s
macos-14 head	16s
macos-14 3.4	15s
macos-14 2.7	30s
	6m 31s

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