code: public static Appendable leftShift(Appendable self, Object value) throws IOException {
          InvokerHelper.append(self, value);
          return self;
      }
docs: Overloads the leftShift operator for Appendable to allow an object to be appended
  using Groovy's default representation for the object.
  
  @param self  an Appendable
  @param value an Object whose default representation will be appended to the Appendable
  @return the Appendable on which this operation was invoked
  @throws IOException if an I/O error occurs.
  @since 2.1.0