code: public static <T> UnaryOperator<T> unaryOperator(CheckedUnaryOperator<T> operator) {
          return Unchecked.unaryOperator(operator, Unchecked.RETHROW_ALL);
      }
docs: Wrap a {@link CheckedUnaryOperator} in a {@link UnaryOperator}.
  <p>
  Example:
  <code><pre>
  Stream.of("a", "b", "c").map(Unchecked.unaryOperator(s -> {
  if (s.length() > 10)
  throw new Exception("Only short strings allowed");
  
  return s;
  }));
  </pre></code>