[Python-Dev] Accepting PEP 3154 for 3.4?

[Serhiy Storchaka]

19.11.13 21:59, Antoine Pitrou написав(ла):
> Note some drawbacks of frame opcodes:
> - the decoder has to sanity check the frame opcodes (what if a frame
>    opcode is encountered when already inside a frame?)

This is only one simple check when reading the frame opcode.

> - a pickle-mutating function such as pickletools.optimize() may naively
>    ignore the frame opcodes while rearranging the pickle stream, only to
>    emit a new pickle with invalid frame sizes

But with naked frame sizes without opcodes it have even more chance to 
produce invalid pickle.