ModGC

[rubygems/rubygems] test(ruby): fix spelling #46

Job	Run time
check (mmtk, release, macos-latest)	9m 15s
check (default, macos-latest)	6m 55s
check (mmtk, release, ubuntu-latest)	9m 20s
check (default, ubuntu-latest)	7m 10s
	32m 40s

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