Merge pull request #492 from ruby/mvh-fix-pvalue-display #1790

Job	Run time
test (head)	51s
benchmark-ractor (head)	6m 42s
benchmark-run-once	1m 37s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	12m 50s
test (truffleruby)	1m 48s
benchmark-ractor-only (head)	56s
benchmark-default (ruby)	11m 16s
benchmark-default (head)	12m 31s
test (ruby)	54s
benchmark-graph	50s
all-tests	2s
	50m 17s

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