*<Null safety>*
int lowerBoundBy <K extends Comparable<K>>(E element, K keyOf(E), [int start = 0, int? end])
int lowerBoundBy<K extends Comparable<K>>(E element, K Function(E) keyOf, [int start = 0, int? end]) => algorithms.lowerBoundBy<E, K>( this, keyOf, compareComparable, element, start, end);