Merge pull request #483 from ruby/mvh-interleave #1734

Job	Run time
benchmark-ractor (head)	6m 42s
benchmark-run-once	1m 40s
benchmark-graph	41s
test (ruby)	47s
benchmark-default (head)	12m 27s
benchmark-default (ruby)	13m 31s
test (truffleruby)	1m 46s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	13m 33s
test (head)	49s
benchmark-ractor-only (head)	38s
all-tests	2s
	52m 36s

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