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sets in str.cat?! #23009
These objects should imo clearly be disallowed, lest users shoot themselves in the foot massively:
I'm not even sure this should go through a deprecation cycle - IMO it's just a plain ol' bug that should be fixed ASAP.
In fact, I'm struggling to think of a use-case in pandas where the order is irrelevant - it's a different (and larger) discussion whether that aspect of