Add `.get(range)` #915

Job	Run time
msrv	43s
doc	16s
check	18s
check format	12s
check (--no-default-features)	18s
semver-checks	2m 30s
test	1m 1s
check (--no-default-features --features use_alloc)	14s
check (--all-targets --all-features)	24s
All checks succeeded	1s
	5m 57s

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