code: public static String drop(GString self, int num) {
          return drop(self.toString(), num).toString();
      }
docs: A GString variant of the equivalent CharSequence method.
  
  @param self the original GString
  @param num the number of characters to drop from this iterator
  @return a String consisting of all characters except the first <code>num</code> ones,
  or else an empty String, if the toString() of this GString has less than <code>num</code> characters.
  @see #drop(CharSequence, int)
  @since 2.3.7