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Scrub invalid UTF-8 bytes from debuggee output in tests #1809

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (3.0)	2m 8s
test (3.2)	2m 15s
test (debug)	6m 4s
test (3.1)	2m 11s
test (2.7)	2m 21s
test (3.3)	2m 13s
test (3.4)	2m 10s
test (head)	1m 56s
test (4.0)	2m 17s
	23m 39s