test

Add 'digest' option #274

Job	Run time
ruby-versions / Generate Ruby versions	4s
build (2.5 / ubuntu-latest)	26s
build (2.5 / windows-latest)	2m 6s
build (2.6 / ubuntu-latest)	24s
build (3.0 / windows-latest)	55s
build (2.7 / macos-latest)	42s
build (2.6 / windows-latest)	1m 50s
build (2.7 / windows-latest)	1m 35s
build (3.1 / windows-latest)	58s
build (3.2 / macos-latest)	13s
build (3.1 / ubuntu-latest)	10s
build (3.3 / ubuntu-latest)	15s
build (3.0 / macos-latest)	20s
build (3.2 / ubuntu-latest)	14s
build (3.4 / ubuntu-latest)	12s
build (2.7 / ubuntu-latest)	27s
build (3.1 / macos-latest)	20s
build (3.0 / ubuntu-latest)	9s
build (3.4 / macos-latest)	18s
build (3.3 / windows-latest)	1m 6s
build (3.4 / windows-latest)	1m 11s
build (3.2 / windows-latest)	1m 4s
build (2.6 / macos-latest)	43s
build (jruby-head / ubuntu-latest)	48s
build (truffleruby / macos-latest)	22s
build (head / macos-latest)	15s
build (jruby / ubuntu-latest)	1m 8s
build (3.3 / macos-latest)	10s
build (mingw / windows-latest)	55s
build (mswin / windows-latest)	58s
build (truffleruby-head / macos-latest)	24s
build (head / ubuntu-latest)	8s
build (truffleruby-head / ubuntu-latest)	27s
build (truffleruby / ubuntu-latest)	23s
	21m 40s

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