BUG: Index.fillna silently ignoring 'downcast' kwarg #44873
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jreback
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can you add a whatsnew note. also were some examples in the OP which maybe worth adding as tests |
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Decided to raise rather than silently give incorrect result. Haven't decided about deprecation, since there's an argument to be made for trying to make the downcast kwarg/behavior match Series.fillna (which is itself a can of worms).
Found along the way that CategoricalIndex.fillna can be removed; can make this a separate PR upon request.