Reduce comparisons when parsing numbers #640

Job	Run time
Ruby memcheck	1m 1s
ruby-versions / Generate Ruby versions	4s
ubuntu-22.04 2.7	1m 6s
ubuntu-22.04 3.0	30s
ubuntu-22.04 3.1	34s
ubuntu-22.04 3.2	27s
ubuntu-22.04 3.3	35s
ubuntu-22.04 head	1m 18s
ubuntu-22.04 jruby	1m 2s
ubuntu-22.04 jruby-head	1m 1s
macos-13 2.7	1m 43s
macos-13 3.0	45s
macos-13 3.1	38s
macos-13 3.2	46s
macos-13 3.3	48s
macos-13 head	35s
macos-13 jruby	1m 12s
macos-13 jruby-head	1m 28s
macos-14 2.7	51s
macos-14 3.0	23s
macos-14 3.1	37s
macos-14 3.2	28s
macos-14 3.3	22s
macos-14 head	19s
macos-14 jruby	45s
macos-14 jruby-head	48s
windows-latest 2.7	4m 59s
windows-latest 3.0	2m 56s
windows-latest 3.1	2m 57s
windows-latest 3.2	3m 42s
windows-latest 3.3	4m 3s
windows-latest head	1m 35s
windows-latest mswin	1m 46s
ubuntu-latest jruby-9.4	1m 1s
macos-latest truffleruby-head	38s
ubuntu-latest truffleruby-head	2m 31s
	46m 14s

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