Add a stable sort #75

Job	Run time
Ruby 2.6 - macos-latest	1m 5s
Ruby 2.7 - macos-latest	1m 10s
Ruby 3.0 - macos-latest	43s
Ruby 3.1 - macos-latest	1m 5s
Ruby 3.2 - macos-latest	29s
Ruby 3.3 - macos-latest	47s
Ruby head - macos-latest	35s
Ruby jruby - macos-latest	1m 9s
Ruby jruby-head - macos-latest	1m 12s
Ruby truffleruby - macos-latest	1m 45s
Ruby truffleruby+graalvm - macos-latest	5m 51s
Ruby 2.6 - ubuntu-20.04	34s
Ruby 2.7 - ubuntu-20.04	27s
Ruby 3.0 - ubuntu-20.04	17s
Ruby 3.1 - ubuntu-20.04	20s
Ruby 3.2 - ubuntu-20.04	18s
Ruby 3.3 - ubuntu-20.04	23s
Ruby head - ubuntu-20.04	14s
Ruby jruby - ubuntu-20.04	1m 11s
Ruby jruby-head - ubuntu-20.04	1m 9s
Ruby truffleruby - ubuntu-20.04	46s
Ruby truffleruby+graalvm - ubuntu-20.04	3m 7s
Ruby mingw - windows-latest	1m 18s
Ruby mswin - windows-latest	1m 12s
Ruby jruby - windows-latest	1m 55s
Ruby head - ubuntu-22.04	17s
Ruby 3.1 - ubuntu-22.04	16s
Ruby 3.2 - ubuntu-22.04	19s
Ruby 3.3 - ubuntu-22.04	25s
Ruby truffleruby+graalvm-head - ubuntu-22.04	3m 16s
Ruby truffleruby-head - ubuntu-22.04	55s
	34m 30s

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