Expressions result in different serializations across Python Polars PATCH version upgrades about polars HOT 1 OPEN

The version number of python and rust are definitely not the same. I think the closest thing to a compatibility matrix is to look at the release history and note what the latest rust version was at any particular python release. In this example, it looks like the rust version was 0.39.0 for python's 0.20.21 and then rust 0.39.2 for python 0.20.22 and 0.20.23.

It would be nice if deserializations were backward compatible although that's more of an enhancement, a challenging one too I think. It might be easier and better for binary size to have a separate tool that can "upgrade" the serialization from one version up to the next rather than relying on the core library to interpret any old version serialization. @MarcoGorelli I know you have a tool that updates the code from one version to the next, any thoughts on this (not that I'm trying to imply that this is in scope for that effort)?

from polars.