Refactor truncate floor and ceil duplicated part #588

Job	Run time
ruby-versions / Generate Ruby versions	4s
ubuntu-latest 2.7	1m 6s
ubuntu-latest 3.2	36s
ubuntu-latest 3.1	36s
ubuntu-latest debug	48s
ubuntu-latest head	31s
ubuntu-latest 3.4	34s
ubuntu-latest 3.3	33s
macos-latest 2.7	59s
macos-latest 3.0	26s
macos-latest 3.2	25s
ubuntu-latest 3.0	35s
macos-latest 3.4	23s
macos-14 2.7	1m 10s
macos-14 3.1	30s
macos-latest debug	33s
macos-latest 3.1	41s
macos-latest 3.3	25s
macos-latest head	26s
macos-14 3.0	24s
macos-14 3.2	39s
macos-14 debug	31s
windows-latest 2.7	3m 55s
macos-14 3.4	23s
macos-14 3.3	25s
macos-14 head	24s
windows-latest 3.4	2m 12s
windows-latest 3.3	2m 13s
windows-latest head	2m 12s
windows-latest mswin	1m 27s
windows-latest mingw	2m 5s
	28m 11s

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