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<d_bot>
<darrenldl> astronavt: python's arrow (popular alternative it seems?) is slightly better: it has a ambiguous flag, but its behaviour otherwise matches pendulum and crystal's
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<d_bot>
<Sonsonroro17> do any of you guys do stock traiding ?
<olle>
We're all invested in Jason Street
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<d_bot>
<sarna> hey, can I somehow rename an opam switch?
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<d_bot>
<undu> no, some things are not relocatable
<astronavt>
@darrenldl people seem to have mostly soured on arrow in favor pendulum; i don't remember the reasons but i remember that people felt strongly about it
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<astronavt>
i think its mostly related to the API though, not necessarily its internal behaviors or data representation
<astronavt>
and there are other examples (albeit ones provided by the pendulum devs) of arrow silently failing in certain cases
<astronavt>
but of course without deep knowledge of this area, one has to take library devs at their word :)
<astronavt>
i haven't filed an issue yet but yes i wouldnt fault any particular library for missing any particular small detail. but iteration towards correctness is always good imo
<d_bot>
<darrenldl> astronavt: interestingly pandas from python community seems to handle date times correctly
<astronavt>
@darrenldl im honestly not surprised, pandas has a huge amount of eyes on it since its one of the core data science libraries
<astronavt>
but its good to know
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<jshshli>
hi! what are good open source projects to contribute to for newcomers
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<Terence>
hey I'm trying to just annotate a int like so: http://ix.io/2W66 but ocaml says "This expression has type int but an expression was expected of type Bar.param1" any idea how to make it work?
<Terence>
it works if I remove the signature but I don't understand why
<dh`>
by giving the module an explicit module type you've made the type abstract
<dh`>
since the signature you used doesn't specify what the type is.
<dh`>
that's more or less what signatures are for
<steenuil>
you can make the type concrete by specifying the type as `FOO with t = int`
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<steenuil>
as in `module Bar : FOO with t = int = ...`
<dh`>
or just not use the signature
<dh`>
but since this is obviously a toy example it's hard to know what they're trying to do
<steenuil>
does cohttp raise any exceptions? I can't find anything in the docs
<dh`>
don't you wish we had checked exceptions...
<steenuil>
yeah, I kinda do
<Terence>
thank you for your answers! We are given a signature which contains 2 type declaration and then we are told to define one as string and the other one as an int. I wrote the module and all seems well and then I want to use it and that's where I had issue.
<d_bot>
<mseri> Very few of its own, mostly io errors. But exceptions raised by other functions propagate
<d_bot>
<mseri> Like closed chsnnels, tls errors, ...
<d_bot>
<mseri> (This was in reply to steenuil, I had not no5iced you are on irc, sorry)
<steenuil>
no worries, thank you
<Terence>
I thought while the sig doesn't specify the type it has, because Bar specifies it I can say "I want to use Bar including the types that it instantiated"
<steenuil>
I guess I'll just have to have a catch all exceptions then
<Terence>
d_bot is bridging irc with what?
<steenuil>
discord
<Terence>
hence the d got it
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<Terence>
so if I declare a type in a sig, create a module that uses the sig and instantiate the type, and make this type a paramater of a function of the module, how do I call the function of the module?
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<dh`>
if you make the type abstract by sealing the module with a signature that doesn't export it, the only way you can get values of that type is from the module via its interface