Document intended compatibility

Apologies if this is the wrong place to raise this concern - I would normally bring this up on a community forum / chat, but I don't see one.

It would be nice if we could clarify the intended compatibility of serialized objects across cloudpickle versions. I'm in a situation where I'll need to be able to read objects serialized by an older version of cloudpickle using a newer version. Is there a range of versions that are supposed to work (specifically, I'd like to read objects that were written with 0.5.3 with the latest version)? Or is any such incompatibility considered a bug?

I've done some sanity tests and it seems to work, but I don't want to risk running into an edge case if this is already known to be an unreliable, unsupported or bad practice or something.