public function setAll( ?KeyedTraversable<Tk,Tv> $iterable, ): Map<Tk, Tv>;
This method is equivalent to
Map::addAll(). If a key to set does not
exist in the Map that does exist in the
Traversable, it is created. This
is inconsistent with, for example, the method
Vector::setAll() where if
a key is not found, an exception is thrown.
Map<Tk, Tv>- Returns itself.