Avoid FutureWarning
that can arise from index dtype inference
#9575
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This is an attempt at closing #8795, which has been showing up with some regularity. I'm not sure if it will do the job, so I plan to kick CI a few times here.
Before merging, it may make sense to use #9570
test_dataframe_aggregations_multilevel[cov-disk-<lambda>1]
#8795pre-commit run --all-files