enhancement request: make py3 read/write py2 pickle format

[random832 at fastmail.us]

On Tue, Jun 9, 2015, at 23:52, Steven D'Aprano wrote:
> > For human readable serialized data, text format protocol buffers are
> > seriously underrated. (Relatedly: underdocumented, too.)
> 
> Ironically, literal_eval is designed to process text-format protocols
> using 
> human-readable Python syntax for common data types like int, str, and
> dict.

"protocol buffers" is the name of a specific tool.