*<Null safety>*
bool remove (E element) override
@override bool remove(E element) { var index = _locate(element); if (index < 0) return false; _modificationCount++; var last = _removeLast(); if (index < _length) { var comp = comparison(last, element); if (comp <= 0) { _bubbleUp(last, index); } else { _bubbleDown(last, index); } } return true; }