claim trait to allow non-fallible cloning #35

Job	Run time
Linting	18s
Test (ubuntu-latest)	15s
Test (ubuntu-latest, --release)	15s
Test (ubuntu-latest, --features=no_std)	15s
Test (ubuntu-latest, --features=no_std, --release)	13s
Test (windows-latest)	15s
Test (windows-latest, --release)	14s
Test (windows-latest, --features=no_std)	15s
Test (windows-latest, --features=no_std, --release)	14s
Test (macos-latest)	16s
Test (macos-latest, --release)	1s
Test (macos-latest, --features=no_std)	1s
Test (macos-latest, --features=no_std, --release)	1s
Test (macos-12)	16s
Test (macos-12, --release)	16s
Test (macos-12, --features=no_std)	15s
Test (macos-12, --features=no_std, --release)	17s
	3m 37s

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