Merge pull request #728 from frederikspang/feature/frozen-strings #435

Job	Run time
Unit test (ubuntu-20.04, 2.1)	56s
Unit test (ubuntu-20.04, 2.2)	1m 5s
Unit test (ubuntu-20.04, 2.3)	1m 0s
Unit test (ubuntu-20.04, 2.4)	1m 3s
Unit test (ubuntu-20.04, 2.5)	28s
Unit test (ubuntu-20.04, 2.6)	33s
Unit test (ubuntu-20.04, 2.7)	31s
Unit test (ubuntu-20.04, 3)	14s
Unit test (ubuntu-20.04, 3.1)	18s
Unit test (ubuntu-20.04, 3.2)	17s
Unit test (ubuntu-20.04, 3.3)	15s
Unit test (ubuntu-20.04, jruby-9.1)	58s
Unit test (ubuntu-20.04, jruby-9.2)	1m 0s
Unit test (ubuntu-20.04, jruby-9.3)	52s
Unit test (ubuntu-20.04, jruby-9.4)	47s
Unit test (ubuntu-20.04, truffleruby)	1m 50s
Unit test (macos-latest, 2.6)	37s
Unit test (macos-latest, 2.7)	41s
Unit test (macos-latest, 3)	20s
Unit test (macos-latest, 3.1)	23s
Unit test (macos-latest, 3.2)	18s
Unit test (macos-latest, 3.3)	27s
Unit test (macos-latest, jruby-9.3)	48s
Unit test (macos-latest, jruby-9.4)	41s
Unit test (macos-latest, truffleruby)	1m 25s
Unit test (windows-latest, 2.2)	3m 6s
Unit test (windows-latest, 2.3)	1m 45s
Unit test (windows-latest, 2.4)	1m 30s
Unit test (windows-latest, 2.5)	4m 51s
Unit test (windows-latest, 2.6)	2m 59s
Unit test (windows-latest, 2.7)	2m 1s
Unit test (windows-latest, 3)	3m 57s
Unit test (windows-latest, 3.1)	1m 49s
Unit test (windows-latest, 3.2)	1m 52s
Unit test (windows-latest, 3.3)	1m 27s
finish	0s
	43m 4s

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