claim trait to allow non-fallible cloning #36

Job	Run time
Linting	17s
Test (ubuntu-latest)	13s
Test (ubuntu-latest, --release)	16s
Test (ubuntu-latest, --features=no_std)	14s
Test (ubuntu-latest, --features=no_std, --release)	17s
Test (windows-latest)	1m 39s
Test (windows-latest, --release)	2m 7s
Test (windows-latest, --features=no_std)	2m 17s
Test (windows-latest, --features=no_std, --release)	1m 35s
Test (macos-latest)	26s
Test (macos-latest, --release)	19s
Test (macos-latest, --features=no_std)	22s
Test (macos-latest, --features=no_std, --release)	21s
Test (macos-12)	32s
Test (macos-12, --release)	42s
Test (macos-12, --features=no_std)	31s
Test (macos-12, --features=no_std, --release)	39s
	12m 47s

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