[issue13505] Bytes objects pickled in 3.x with protocol <=2 are unpickled incorrectly in 2.x

[sbt]

sbt <shibturn at gmail.com> added the comment:

I now realise latin_1_encode won't work because it returns a pair (bytes_obj, length).

I have done a patch using _codecs.encode instead -- the pickles turn out to be exactly the same size anyway.

>>> pickletools.dis(pickle.dumps(b"abc", 2))
    0: \x80 PROTO      2
    2: c    GLOBAL     '_codecs encode'
   18: q    BINPUT     0
   20: X    BINUNICODE 'abc'
   28: q    BINPUT     1
   30: X    BINUNICODE 'latin1'
   41: q    BINPUT     2
   43: \x86 TUPLE2
   44: q    BINPUT     3
   46: R    REDUCE
   47: q    BINPUT     4
   49: .    STOP

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Added file: http://bugs.python.org/file23938/issue13505-codecs-encode.patch

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