`k_smallest` variants (2) #798

Job	Run time
doc	15s
check format	7s
check	27s
check (--no-default-features)	9s
msrv	56s
check (--no-default-features --features use_alloc)	16s
semver-checks	2m 25s
test	53s
check (--all-targets --all-features)	27s
All checks succeeded	1s
	5m 56s

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