Add tests to ensure backward compatibilities #5

Job	Run time
ruby-versions / Generate Ruby versions	4s
windows-latest 2.6	1m 38s
windows-latest 2.3	1m 21s
ubuntu-latest 2.5	30s
ubuntu-latest 3.2	12s
windows-latest 2.7	1m 33s
macos-latest 3.0	16s
macos-latest 3.1	15s
macos-latest 2.7	39s
windows-latest 3.2	47s
ubuntu-latest 3.0	9s
ubuntu-latest 2.3	24s
windows-latest 2.5	1m 34s
macos-latest 2.6	41s
windows-latest 2.4	1m 26s
ubuntu-latest 2.7	33s
ubuntu-latest 2.4	27s
windows-latest 3.3	1m 0s
ubuntu-latest 3.1	11s
windows-latest 3.0	54s
macos-latest 3.2	22s
windows-latest 3.4	49s
macos-latest 4.0	11s
macos-latest 3.4	11s
macos-15-intel 2.4	1m 0s
ubuntu-latest 4.0	13s
windows-latest mingw	44s
windows-latest 4.0	1m 2s
macos-latest 3.3	20s
macos-15-intel 2.5	1m 17s
ubuntu-latest 3.4	14s
ubuntu-latest 3.3	12s
windows-latest mswin	57s
ubuntu-latest head	9s
macos-latest head	11s
macos-15-intel 2.3	1m 6s
windows-latest 3.1	1m 3s
ubuntu-latest 2.6	27s
	25m 2s

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