code: def __repr__(self):
      return "FlinkCoder[%s]" % repr(self._internal_coder)
  
imports: from apache_beam.coders import Coder
  from apache_beam.coders.coders import FastCoder, LengthPrefixCoder
  from apache_beam.portability import common_urns
  from apache_beam.typehints import typehints
  from pyflink import fn_execution
  from pyflink.fn_execution.coders import LengthPrefixBaseCoder
  from pyflink.fn_execution.flink_fn_execution_pb2 import CoderInfoDescriptor
label_desc: Use image node_id 6 for calling the FlinkCoder obj's underlying member method code with example usage: obj.__repr__() and returns: unknown