Specialize `TakeWhileInclusive::fold` #703

Job	Run time
doc	9s
check format	6s
msrv	42s
check	8s
test	48s
check (--no-default-features)	6s
check (--no-default-features --features use_alloc)	11s
check (--all-targets --all-features)	28s
All checks succeeded	1s
	2m 39s

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