cloneSet<E> method
Clones a set, producing a new set with cloned elements.
Each element in the source set is cloned according to the cloner's rules.
Implementation
@override
Set<E> cloneSet<E>(Set<E> source) {
_log('cloneSet<$E>: length=${source.length}, type=${source.runtimeType}');
return super.cloneSet<E>(source);
}