class_docstr: Pass bytes through unchanged.
code: def decode(b, final=False):
      return b
  
imports: from io import StringIO, BytesIO
  import codecs
  import os
  import sys
  import re
  import errno
  from .exceptions import ExceptionPexpect, EOF, TIMEOUT
  from .expect import Expecter, searcher_string, searcher_re
label_desc: Use image node_id 2 for calling the _NullCoder obj's underlying member method code with example usage: obj.decode(b, final) and returns: b