BUG: Undo result type change of quantile/percentile but keep q precision (#30601) #30623
+73
−29
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Backport of #30601.
Defer cast to input type to the end of the computation by passing through the
weak_qinformation.This fixes gh-30586, but I am not sure it is great to backport. Although, compared to the other PR it should just align the nan-functions fully and otherwise revert anything that isn't just a precision fix.
If we don't want to backport this, I would be tempted to just revert the original PR for 2.5, TBH.
This still needs tests, althoughit passes all tests added in gh-29105.