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it makes things kind of semantically weird to have identical non-null values which are nonequal, for instance, if NaN != NaN, should two rows both be able to have a NaN PK? i think the reasonable answer is no, but you now have two different notions of "equal"
it wouldn't be sql if we weren't making bizarre tradeoffs!
I'd love to be horrified by someone who has an actual production table using a float PK (my bet is that the PK is used for ordering or something and they used a float so they can re-order without changing other records PKs)
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