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2021-08-29 00:11:47 <koz> The documentation for Data.Complex.Complex refers to an Ord instance, but that data type lacks one. Is this a typo, or is the instance cleverly hidden someplace?
2021-08-29 00:15:30 <geekosaur> strictly speaking it shouldn't have one
2021-08-29 00:18:29 <koz> Agreed, but this documentation suggests it existed once, got removed, but not completely.
2021-08-29 00:18:51 <koz> I mean, even Gaussian integers don't have a total order that respects arithmetic.
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2021-08-29 00:46:35 <monochrom> I think it's just a matter of forgetting to delete a sentence.
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2021-08-29 02:01:03 <iqubic> Why doesn't Complex have an ord instance? Data.Linear's V2 type has one. https://hackage.haskell.org/package/linear-1.21.6/docs/Linear-V2.html
2021-08-29 02:01:11 <iqubic> I fail to see the difference there.
2021-08-29 02:09:03 <pavonia> I guess it's only there for practical reasons like storing those numbers in a Map
2021-08-29 02:09:39 <geekosaur> does V2 have a Num instance?
2021-08-29 02:10:03 <pavonia> Yes
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2021-08-29 02:10:41 <janus> could the reason why V2 has one and Complex doesn't be, that people usually mention the x axis before the y axis? but complex is not for cartesian coordinates
2021-08-29 02:11:20 <janus> i am not great at math, be kind :P
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2021-08-29 02:13:13 <janus> or do you think that V2 is not just for cartesian coordinates?
2021-08-29 02:16:21 <nshepperd> it's a matter of ideology
2021-08-29 02:16:40 <nshepperd> and the maintainer of linear is different from the maintainers of base
2021-08-29 02:17:40 <janus> nshepperd: what is an example of an ideological opinion we're seeing here?
2021-08-29 02:18:09 <nshepperd> that the ordering expressed by Ord must be compatible with arithmetic
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2021-08-29 02:20:20 <janus> so "class Ord" is underspecified because it doesn't state its opinion? not necessarily sinfully underspecified, but underspecified, right?
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2021-08-29 02:24:29 <nshepperd> it mentions that there aren't any laws in the haskell report, but does state desiderata that it should at least be a non strict partial order
2021-08-29 02:25:01 <nshepperd> you could take that as stating an opinion against such a requirement or as stating no opinion i suppose
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2021-08-29 02:45:18 <shachaf> Double has an Ord instance, so who knows what it means, really.
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2021-08-29 03:27:27 <NoidedSuper> As horrible as working with type-level stuff in Haskell can be
2021-08-29 03:27:33 <NoidedSuper> When you get it working it feels so, so good
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2021-08-29 03:27:58 <NoidedSuper> (sneak preview of a thing I hope will eventually be really useful to a lot of people: https://gist.github.com/AnthonySuper/eecf08998135685774cfbc17f484327b)
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