build

Do not repeat conversions to string #1815

Job	Run time
ruby-versions / Generate Ruby versions	5s
build (2.7 / ubuntu-latest)	36s
build (2.6 / windows-latest)	2m 23s
build (2.7 / macos-latest)	48s
build (2.6 / macos-latest)	38s
build (3.0 / macos-latest)	22s
build (3.0 / ubuntu-latest)	24s
build (2.7 / windows-latest)	1m 57s
build (3.1 / ubuntu-latest)	18s
build (3.1 / windows-latest)	1m 26s
build (3.2 / macos-latest)	22s
build (3.3 / ubuntu-latest)	23s
build (3.2 / ubuntu-latest)	24s
build (3.3 / windows-latest)	2m 12s
build (3.0 / windows-latest)	1m 34s
build (3.1 / macos-latest)	25s
build (3.4 / ubuntu-latest)	22s
build (3.4 / windows-latest)	1m 23s
build (3.3 / macos-latest)	18s
build (head / ubuntu-latest)	20s
build (3.2 / windows-latest)	2m 3s
build (2.6 / ubuntu-latest)	31s
build (mingw / windows-latest)	1m 11s
build (mswin / windows-2022)	1m 19s
build (3.4 / macos-latest)	23s
build (truffleruby-head / ubuntu-latest)	47s
build (truffleruby-head / macos-latest)	38s
build (head / macos-latest)	26s
	23m 58s

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