Ensure all lists of lists are marked as rectangular tables when approriate #5450
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Fixes #5449
Basically, we were inconsistent on if we treated lists of lists as if they were rectangular tables, depending on what type the inner lists were.
I have tried to very carefully write the code so in the standard cases where everything is a plist of plist, or a plist of not lists, the code is exactly as fast as it used to be -- I tried benchmarking this and I couldn't measure any differences.