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								<p>My only concern is it won’t be optional because I’d rather not use it.</p>
<p>To elaborate.. Prior to Elixir I used to be all about strong typed languages. Within days of using it, I realized that Elixir does not need strong typing. I learned to appreciate Elixir’s minimalism and readability that typed languages can’t have.</p>
<p>In my view a clear-cut separation of typing as it is done with typespecs is just fine while any mandatory typing would make the code less readable.</p>
<p>Therefore, whatever you do, please, make it optional.</p>
<p>Thanks</p>
<p><a class="mention" href="/u/josevalim" rel="nofollow">@josevalim</a><br>
Maybe we better ask why thinking of a typing system in the first place.</p>
<p>What Elixir bought me with was its efficiency, but what kept me with it was its intrinsic beauty (and efficiency :))<br>
In C++ I used to spend 80% of the time describing what should not happen (what the user cannot do with my constructs). In Elixir I spend 100% of the time on what should happen. Please, do not spoil that.</p> 
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								<p>I am worried:</p>
<ul>
<li>It will become unreadable or more of a hassle like TypeScript.</li>
<li>It will be all or nothing.</li>
<li>With the above, Elixir will loose its vibe (I know I am not specific here).</li>
</ul> 
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								<p>My biggest concern is the <strong>impact in readability</strong>. Case in point, reading TypeScript code vs JavaScript, in some cases is so much more complicated because expressing types can become very complicated.</p>
<p>Second has been mentioned, is the <strong>possible fragmentation of the community</strong>, though I don’t think it has had a big impact in Python when they introduced type hints.</p> 
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								<p>My concern is that we will have 2 ways to declare types: type specs and the new syntax. It may be confusing, especially, to newcomers.</p> 
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								<p>Typescript can be a joy to work with, but in certain cases the extra effort spent trying to convince it what you’re doing is OK can be quite tedious and result in cluttering the code. A minimalist example (real world ones can be much messier and puzzling) would be:</p>
<pre data-code-wrap="elixir"><code class="lang-elixir">const maybeNumbers = [1, 2, null, 4, undefined];

// Type '(number | null |undefined)[]' is not assignable to type 'number[]'.
const nok: number[] = maybeNumbers.filter(x =&gt; x != null);

const ok: number[] = maybeNumbers.filter((x): x is number =&gt; x != null);
</code></pre>
<p>I worry that we similarly need to jump through hoops to make the compiler happy even if the original code is perfectly clear and free of errors.</p> 
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								<p>Community/ecosystem fragmentation</p> 
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								<p>I’ve gone down some deep rabbit holes trying to understand generic variance in Kotlin, especially co- and contra-variance, which can be very counter-intuitive. My guess is that this kind of thing has prevented few bugs but cost huge amounts of development time.</p>
<aside class="onebox allowlistedgeneric" data-onebox-src="https://typealias.com/guides/ins-and-outs-of-generic-variance/">
  <header class="source">

      <a href="https://typealias.com/guides/ins-and-outs-of-generic-variance/" target="_blank" rel="noopener nofollow ugc">Dave Leeds on Kotlin</a>
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<h3><a href="https://typealias.com/guides/ins-and-outs-of-generic-variance/" target="_blank" rel="noopener nofollow ugc">The Ins and Outs of Generic Variance in Kotlin</a></h3>

  <p>The ultimate guide to understanding generics, covariance, contravariance, and type projections in Kotlin. Learn two simple subtyping rules that explain why generic variance works the way that it does.</p>


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								<p>Tooling will not adapt to the type system quickly. So editor plugins for linting and auto completion will break or not be as useful.</p> 
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								<p>When I first started learning JavaScript, <code>let</code> and <code>const</code> had just been introduced. And so, any learning materials or references that used <code>var</code> instead of the newer syntax had an immediate turn-off effect on me (maybe it’s my OCD).</p>
<p>Basically, I worry that a similar thing could happen where a newcomer sees an existing book or blog post that is using syntax from before there were types and immediately disregard it because they think it’s outdated or not current enough.</p>
<p>Also, a lot of people have very strong opinions about how a language looks. Elixir code looks good to me. I wouldn’t want to mess that up, and I wouldn’t want people to avoid Elixir because they think it looks odd, or weird or something.</p>
<p>I think it will be ok though; you do what you think is best.</p> 
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								<p>I’m worried that type inference (which we definitely will need to make type checking “opt-in” or gradual), will capture intend wrongly.</p>
<p>Lets say I return a function with arity 2 from another function. Will this be infered as a generic <code>fun/2</code> type, as its actual type including argument types, or will it detect this as a <code>Stream.t</code>, <code>Enumerable.t</code>, or whatever else <s>trait</s> protocol is implemented for fun/2 types?</p>
<hr>
<p>I am also worried that we might loose ability to implement some edge cases, as the type system is not able to express such a thing.</p> 
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