DOC: mention that stack/unstack implicicly sort #7937
Merged
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It took me a while to discover what was causing this TypeError... I guess this can be useful to other people.
(Yes, I know there is a note somewhere warning users that some operations depend on the index being sorted, but maybe this is a sligthly different case, since the operations do work after all, the problem is they do something more than what is documented)