enhancement request: make py3 read/write py2 pickle format

[Marko Rauhamaa]

Devin Jeanpierre <jeanpierreda at gmail.com>:

> For example, one can also imagine testing that a serialized structure
> is identical across version changes, so that it's guaranteed to be
> forwards/backwards compatible. It is not enough to test that the
> deserialized form is, because it might differ substantially, as long
> as the communicated serialized structure is the same.

There are merits to canonical serialization formats, but that approach
to testing is far too simplistic. A test case should accept all observed
behavior that is correct.


Marko