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Is it the pickling / serialization that is sensitive to even minor version changes in Python ? I think adding 3.4 might be fine as it is probably in the top-3 of versions used (see https://hynek.me/articles/python3-2016 for example), but maintaining more versions does make testing etc. more expensive
Agree on that testing is one huge concern here.
The hope here is that differences between subversion should be small and easy to fix.