mutable.SetBuilder uses '+' which is not a primitive for anything extending mutable.SetLike, this causes serious performance issues since each time 'elems = elems + x' is evaluated elems is cloned (which is O(n)).
mutable.SetBuilder uses '+' which is not a primitive for anything extending mutable.SetLike, this causes serious performance issues since each time 'elems = elems + x' is evaluated elems is cloned (which is O(n)).
Fortunately GrowingBuilder comes to rescue.
A template for mutable sorted set companion objects.