code: func (s1 Byte) Equal(s2 Byte) bool {
  	return len(s1) == len(s2) && s1.IsSuperset(s2)
  }
docs: // Equal returns true if and only if s1 is equal (as a set) to s2.
  // Two sets are equal if their membership is identical.
  // (In practice, this means same elements, order doesn't matter)