Merge pull request #473 from ruby/rwstauner/diff-all-keys #1700

Job	Run time
benchmark-ractor (head)	6m 33s
benchmark-graph	45s
benchmark-ractor-only (head)	38s
benchmark-default (head)	14m 30s
benchmark-run-once	1m 38s
test (ruby)	48s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	13m 3s
benchmark-default (ruby)	12m 24s
test (head)	48s
test (truffleruby)	1m 46s
all-tests	4s
	52m 57s

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