Returns a lazy, access elements only when needed view of the current
public function lazy(): HH\Rx\KeyedIterable<int, mixed>;
Normally, memory is allocated for all of the elements of the
With a lazy view, memory is allocated for an element only when needed or
used in a calculation like in
Pairs only have two elements. So the performance impact on
Pair will be not be noticeable in the real world.
HH\Rx\KeyedIterable<int, mixed> - an integer-keyed KeyedIterable representing the lazy view into