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Cover option-shaped branch operands in checkout #3177

Job	Run time
install/import (windows-latest, 3.10)	1m 8s
install/import (ubuntu-24.04, 3.8)	16s
install/import (ubuntu-24.04, 3.9)	18s
install/import (windows-latest, 3.9)	1m 7s
install/import (ubuntu-latest, 3.10)	14s
install/import (macos-latest, 3.10)	40s
install/import (windows-latest, 3.8)	1m 5s
install/import (macos-latest, 3.9)	41s
install/import (macos-latest, 3.8)	1m 19s
test (ubuntu, 3.14)	4m 43s
test (macos, 3.11)	15m 45s
test (ubuntu, 3.15t)	5m 16s
test (ubuntu, 3.15)	3m 58s
test (macos, 3.12)	15m 8s
test (windows, 3.15)	35m 5s
test (ubuntu, 3.13)	5m 37s
test (ubuntu, 3.12)	4m 45s
test (ubuntu, 3.11)	4m 46s
test (windows, 3.15t)	41m 32s
test (windows, 3.13)	53m 43s
test (ubuntu, 3.14t)	1m 26s
test (macos, 3.14)	15m 57s
test (windows, 3.12, gix)	40m 31s
test (macos, 3.12, gix)	11m 41s
test (ubuntu, 3.12, gix)	4m 11s
test (windows, 3.12)	54m 21s
test (windows, 3.14)	42m 27s
test (windows, 3.11)	54m 53s
test (windows, 3.14t)	34m 34s
test (macos, 3.15)	11m 14s
test (macos, 3.13)	15m 4s
	8h 3m 25s