Add clone exception #645

Job	Run time
rust_ci (ubuntu-latest, stable)	22s
rust_ci (macos-latest, beta)	33s
rust_ci (macos-latest, stable)	25s
rust_ci (ubuntu-latest, beta)	26s
rust_ci (windows-latest, stable)	28s
rust_ci (windows-latest, beta)	28s
	2m 42s

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