def write(key, value, binary = false)
      value = @conn.class.encode_value(value, binary)
      result = @conn.call(:write, [key, value])
      @conn.class.check_fail_abort(result)
      @conn.class.process_result_commit(result)
    end
def write(key, value, binary = false)
      value = @conn.class.encode_value(value, binary)
      result = @conn.call(:write, [key, value])
      @conn.class.check_fail_abort(result)
      @conn.class.process_result_commit(result)
    end
Write the value to key.