[issue6137] Make pickle generated by Python 3.x compatible with 2.x and vice-versa.

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

I vaguely remember you rejecting a proposal along these lines when Brett
was doing the library renaming.  

The patch (as applied) turns on the renaming automatically when used
with protocol 2 (i.e. all object names are stored with their 2.x names,
not their new names).   Hagen points out that 3.1 proto 2 pickles can't
be read by 3.0.  I would think that the back-translation should be
disabled by default or else we're going to live with the 2.x names for a
very long time.

I don't care much one way or the other.  Just thought you should see it
before it got released and set in stone.  It's not too late for a one
line change, setting the fix_imports default from True to False.

FWIW, the argument for leaving the default as True is the theory that
anyone using protocol 2 is likely doing so to exchange data with 2.x.

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nosy: +rhettinger

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