Prefer str | list[str]
over Sequence[str]
#240
Merged
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see #212
This would make it clearer that you can either pass a single column name, or a list of column names.
Sequence[str]
would accept'abcd'
but it's ambiguous whether that means "column 'abcd'" or "columns 'a', 'b', 'c', 'd'", given thatstr
is itself aSequence[str]