datastore: stabilize dataframe sorts #1549
Merged
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This fixes some very real issues with dataframe sorting that cost me some hair when implementing tests for the defunct #1527.
This does not fix #894, as there is in fact a very real bug in the GC and the flakiness is justified; but that's a topic for another PR that I'll cover tomorrow when I can finally focus on GC stuff.
(github won't let me not close #894 now that I've mentioned it apparently... I'll re-open it manually once this is merged...)