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Greg Egan's _Diaspora_ (1997) and _Oceanic_ (1998) come to my mind. Of course not really predating, with what we now recognize as gender fluidity existing for thousands of years, but in any case early texts long before the notion rose to be widely known in our culture.

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Those are probably written too late, I'd say they would need to be written in 1990 or before to really count as predicting anything. Though actually, if they predict it with more accuracy and say how common it is (so it's not just the one weird character being weird, but also not being anywhere close to everyone) that might be something as well.

Fair. (In _Diaspora_ many people are; in _Oceanic_, all.)

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