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2026-02-23 20:08:08 <EvanR> the extent to which as programmers we run into or invent situations where x==y implying f(x)==f(y) doesn't hold
2026-02-23 20:09:12 <haskellbridge> <loonycyborg> wouldn't that violate referential trasparency? :P
2026-02-23 20:09:18 Beowulf joins (florian@sleipnir.bandrate.org)
2026-02-23 20:09:35 <EvanR> good question
2026-02-23 20:12:34 humasect joins (~humasect@dyn-192-249-132-90.nexicom.net)
2026-02-23 20:13:28 <EvanR> > let f x y = (x == y, isNegativeZero x == isNegativeZero y) in f 0.0 (-1e-400)
2026-02-23 20:13:29 <lambdabot> (True,False)
2026-02-23 20:14:28 <haskellbridge> <loonycyborg> ah yes == isn't the same as it being same object
2026-02-23 20:15:49 <haskellbridge> <loonycyborg> since we're free to implement == however we want, we can even violate basic properties of equality like reflexivity.
2026-02-23 20:15:49 <EvanR> while same object speaks to me as same StableName
2026-02-23 20:15:57 poscat joins (~poscat@user/poscat)
2026-02-23 20:15:57 <EvanR> which is something else again
2026-02-23 20:16:49 tomsmeding . o O ( reallyUnsafePointerEquality )
2026-02-23 20:17:10 × poscat0x04 quits (~poscat@user/poscat) (Ping timeout: 255 seconds)
2026-02-23 20:17:31 <EvanR> can we get a proper equal sign in here xD
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2026-02-23 20:17:50 <tomsmeding> choose your favourite https://tomsmeding.com/unicode#equal
2026-02-23 20:18:35 <EvanR> almost equal to is a perennial favorite
2026-02-23 20:18:41 <int-e> if you're undecided: ⪟
2026-02-23 20:18:48 <tomsmeding> lol
2026-02-23 20:19:10 <tomsmeding> ≊ ALMOST EQUAL OR EQUAL TO is also suspicious -- surely if it's equal, it's also almost equal?
2026-02-23 20:21:16 <EvanR> lol
2026-02-23 20:22:04 <EvanR> so there's an equivalent of equivalences
2026-02-23 20:22:39 × Anarchos quits (~Anarchos@91-161-254-16.subs.proxad.net) (Quit: Vision[]: i've been blurred!)
2026-02-23 20:23:44 <EvanR> loonycyborg, well the slightly deeper issue that satisfying basic properties of equality is in this case... that otherwise sensible definition of (testable in this case) equality isn't universally obeyed. I.e. someone somewhere can observe a distinction between equals
2026-02-23 20:23:49 <EvanR> than*
2026-02-23 20:24:38 <EvanR> so it's like conflating a quotient with a thing being quotiented

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