union method
Returns a new set which is the union of this set and other.
Implementation
TreapSetOfString union(TreapSetOfString other) =>
TreapSetOfString._(base.union(other.base));
Returns a new set which is the union of this set and other.
TreapSetOfString union(TreapSetOfString other) =>
TreapSetOfString._(base.union(other.base));