Apparently, it might affect all CodecInfo objects:

class CodecInfo(tuple):

    def __new__(cls, encode, decode, streamreader=None, 
streamwriter=None,
        incrementalencoder=None, incrementaldecoder=None, name=None):
        self = tuple.__new__(cls, (encode, decode, streamreader, 
streamwriter))
        self.name = name
        self.encode = encode
        self.decode = decode
        self.incrementalencoder = incrementalencoder
        self.incrementaldecoder = incrementaldecoder
        self.streamwriter = streamwriter
        self.streamreader = streamreader
        return self
...