Add `.get(range)` #895

Job	Run time
msrv	43s
doc	8s
check format	10s
check	22s
test	49s
semver-checks	2m 36s
check (--no-default-features)	8s
check (--no-default-features --features use_alloc)	7s
check (--all-targets --all-features)	16s
All checks succeeded	1s
	5m 20s

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