Accept no digits in the fractional part #370

Job	Run time
ruby-versions / Generate Ruby versions	2s
ubuntu-latest 2.7	54s
ubuntu-latest 3.0	31s
ubuntu-latest 3.1	30s
ubuntu-latest 3.2	31s
ubuntu-latest 3.3	33s
ubuntu-latest debug	50s
ubuntu-latest head	34s
macos-latest 2.7	51s
macos-latest 3.0	22s
macos-latest 3.1	29s
macos-latest 3.2	24s
macos-latest 3.3	23s
macos-latest debug	36s
macos-latest head	23s
macos-14 2.7	1m 7s
macos-14 3.0	24s
macos-14 3.1	43s
macos-14 3.2	24s
macos-14 3.3	21s
macos-14 debug	28s
macos-14 head	22s
windows-latest 2.7	5m 36s
windows-latest 3.0	3m 39s
windows-latest 3.1	3m 6s
windows-latest 3.2	4m 3s
windows-latest 3.3	5m 24s
windows-latest head	3m 29s
windows-latest mingw	3m 41s
windows-latest mswin	3m 20s
	44m 0s

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