Oh, you didn’t say it was an env var either. :) I just assumed based on the
casing.

In any case, that’s a C constant. It can only be changed while the VM is
building.

On Fri, Oct 28, 2022 at 07:56 Zach Daniel <zachary.s.dan...@gmail.com>
wrote:

> Sorry, it isn't an environment variable as far as I can tell, its just a
> constant in `erl_map.c`.
> https://github.com/erlang/otp/blob/master/erts/emulator/beam/erl_map.c
>
> In this case I was using string keys, but reducing the likelihood of this
> foot gun in any way is good :)
>
>
> On Fri, Oct 28, 2022 at 12:34 AM, José Valim <jose.va...@dashbit.co>
> wrote:
>
>> Can you please provide the documentation for said environment variable
>> from Erlang?
>>
>> Also note that atom keys will likely no longer be sorted alphabetically
>> in Erlang/OTP 26, which should help with said assumptions.
>>
>> On Fri, Oct 28, 2022 at 06:20 Zach Daniel <zachary.s.dan...@gmail.com>
>> wrote:
>>
>>> Myself and many other developers have been bitten by the fact that maps
>>> are sorted if they have less than 33 elements. Not because we believed that
>>> we should rely on the sort ordering of a map, but because we *accidentally*
>>> wrote an implementation that did, and didn't test it with more than 32
>>> elements. Then at some point later in actual use things get strange, and
>>> debugging the above scenario can be very difficult (but is of course
>>> obvious in retrospect). This could be opt-in or opt-out, all the same to
>>> me, although unless the performance impacts are huge I think that it would
>>> save new developers even more time than experienced developers and so
>>> should potentially be opt-out. After a while when you start to see things
>>> "showing up in weird orders" you have an intuition to go look for a map
>>> being enumerated, but that isn't something a beginner would likely think
>>> of.
>>>
>>> As far as I know this is an erlang thing, but I'm not too familiar with
>>> erlang and thought I'd float it by the elixir group first. I'm also not
>>> sure if its possible to change those constants based on Mix environments
>>> (or to change them at all), but I imagine that is where it will intersect
>>> with Elixir.
>>>
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