Remove magic 7/8 number #13054

Job	Run time
Windows 2022 (check)	1m 35s
Windows 2025-vs2026 (check)	2m 25s
Windows 2022 (test-bundled-gems)	2m 19s
Windows 11-arm (btest test-basic test-tool)	3m 34s
Windows 2025-vs2026 (test-bundled-gems)	2m 34s
Windows result	3s
	12m 30s

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