static Set toSet(O[] array) {
  ret asSet(array);
}



static Set<S> toSet(S[] array) {
  ret asSet(array);
}



static <A> Set<A> toSet(Iterable<A> l) {
  ret asSet(l);
}


// Note: does not clone the set (keeps multiset alive)
static <A> Set<A> toSet(MultiSet<A> ms) {
  ret asSet(ms);
}