[Python-Dev] Increasing the C-optimized pickle extensibility

[Peter Wang]

I strongly second not breaking backwards compatibility and
interoperability, especially for persistent artifacts, unless there is a
*REALLY* good reason.  A potential unintended side effect of such breakages
is that it slows down adoption of the new version.

-Peter

On Fri, Apr 26, 2019 at 10:27 AM Guido van Rossum <guido at python.org> wrote:

> I think it's better not to introduce a new opcode, for the reason you
> stated -- you don't want your pickles to be unreadable by older Python
> versions, if you can help it.
>
>
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