What happens to saved data for different versions
Fragment of a discussion from Talk:Saving
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And the real problem is, if you'd ever changed the format across versions, either overwrite or save elsewhere has to happen, but the former will make it hard to retest older versions, and the latter will at some point drain all your data saving capacity, and you have to back to the former again. Both works unnaturally. And if you don't handle this cases, you'll experience some bugs not locally reproducible.