cloneSet<E> method
Deep-clones a Set with circular reference detection.
Throws CircularReferenceCloneException if a circular reference is detected.
Implementation
@override
Set<E> cloneSet<E>(Set<E> source) {
_assertCircRef(source.hashCode);
_nestIndex++;
final cloned = super.cloneSet<E>(source);
_nestIndex--;
return cloned;
}