Reduce comparisons when parsing numbers #641

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Job	Run time
Ruby memcheck	46s
ruby-versions / Generate Ruby versions	3s
ubuntu-22.04 2.7	53s
ubuntu-22.04 3.0	33s
ubuntu-22.04 3.1	33s
ubuntu-22.04 3.2	31s
ubuntu-22.04 3.3	29s
ubuntu-22.04 head	1m 34s
ubuntu-22.04 jruby	1m 6s
ubuntu-22.04 jruby-head	1m 4s
macos-13 2.7	1m 44s
macos-13 3.0	35s
macos-13 3.1	44s
macos-13 3.2	42s
macos-13 3.3	37s
macos-13 head	36s
macos-13 jruby	1m 24s
macos-13 jruby-head	1m 11s
macos-14 2.7	50s
macos-14 3.0	31s
macos-14 3.1	32s
macos-14 3.2	21s
macos-14 3.3	30s
macos-14 head	18s
macos-14 jruby	1m 3s
macos-14 jruby-head	40s
windows-latest 2.7	3m 47s
windows-latest 3.0	3m 6s
windows-latest 3.1	2m 37s
windows-latest 3.2	3m 45s
windows-latest 3.3	4m 26s
windows-latest head	1m 40s
windows-latest mswin	1m 46s
ubuntu-latest jruby-9.4	1m 4s
macos-latest truffleruby-head	47s
ubuntu-latest truffleruby-head	1m 59s
	44m 47s

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