Merge pull request #481 from ruby/mvh-compact-rss #1726

Job	Run time
benchmark-run-once	1m 41s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	14m 11s
test (truffleruby)	1m 54s
test (ruby)	50s
benchmark-default (ruby)	12m 14s
benchmark-graph	42s
test (head)	42s
benchmark-ractor-only (head)	39s
benchmark-default (head)	14m 14s
benchmark-ractor (head)	6m 44s
all-tests	2s
	53m 53s

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