> dcodeIO (from the AssemblyScript community) was definitely not behaving in good faith

I certainly disagree with that take. I don’t see any bad faith, I only see one person being frustrated because his concerns were being thrown under the rug as "non important", I would recommend you to read on dcode's blog to learn more about it [1]. There are always things to improve regarding how we communicate, of course, but those should not be used as a weapon to attack or dismiss someone but as means to improve.

It's also important to note that a few months after, the Wasm committee realized of the mistake and actually tried to solve it with the Wasm Stringref proposal [2].

The way I see the issue is not about UTF-8 vs UTF-16 but about how valid concerns were completely dismissed in what's supposed to be an open community

[1] https://dcode.io/#webassembly

[2] https://github.com/WebAssembly/stringref

There are valid concerns to be had about string encodings, but I do not think a suggestion to "encourage UTF-8 for new formats and APIs" can be said to "literally breaking the Web Platform", nor does it require tagging 17 people, most of them unrelated, just because you happen to disagree the resolution of the committee.

> I do not think a suggestion to "encourage UTF-8 for new formats and APIs" can be said to "literally breaking the Web Platform"

Perhaps you don’t see it that way, but we have to respect when others do.

From the way I understand things, because JS strings (DOMString [1]) are already represented as UTF-16/WTF-16 internally, making the component model strings only UTF-8 puts certain languages in disadvantage against others specially regarding speed (because they’ll need to do extra effort when processing strings in order to be fully compliant, while the UTF-8 ones wouldn’t need to do it). This was the case for AssemblyScript, Javascript, Java and other JVM-related languages (Kotlin, Scala, ...).

Specifically for a language such as AssemblyScript, for which its aim is to be completely complaint with JS, tiny and fast to execute I can certainly understand why that was a concern and why being dismissed could cause certain frustration.

[1] https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...

Right but it's pretty clear that UTF-8 is the better, de facto choice. JS strings only use UTF-16 for historic reasons. If designed today they would definitely use UTF-8.

Since some languages use UTF-8 and some use UTF-16 you're always going to have some languages doing conversions so it makes sense just to pick the best option surely?

Except that picking the most restrictive option prevents two components that are using the same less restrictive semantics to communicate with each other securely (without throwing exceptions or silently mutating data), e.g. Java <-> Java, AssemblyScript <-> JavaScript. To illustrate, if one would design a Component Model for Java, restricting to UTF-8 would make the Component Model for Java a hazard for Java. The same effect happens in a multi-language Component Model, where some languages then work and others don't. Hence "pick the best option" falls short. The argument in all these questionably stonewalled discussions is basically to allow these languages and use cases to exist, which could be as trivial as to make UTF-8 the default if the WASI folks so wish, but also have a Boolean flag for "don't eagerly mutate on WTF-16 pass-through". Yet, even though trivial and rather obvious, this has been fought relentlessly since 2017, and surely one has to wonder why this vehemence.

UTF-8 is not "more restrictive". I'm not sure what you're talking about.

The value spaces are in fact asymmetric. In Unicode jargon, UTF-8 is a "list of Unicode scalar values" while WTF-16, i.e. UTF-16 as seen in practice, is a "list of Unicode code points (except surrogate pairs)". Unicode code points are a superset of Unicode scalar values, aka "list of Unicode Code Points except surrogate code points", hence conversion from WTF-16 to UTF-8 is lossy. In WTF-16 languages, this is not a problem because the system is designed for WTF-16, but it becomes one if the value space is restricted further, here to UTF-8.

That's why, in such mixed systems, https://simonsapin.github.io/wtf-8/ is typically used. Not UTF-8. And Wasm is such a mixed system.

Conversions like this are basically as fast as a memcpy, which will always be required in this system. Did either you or dcode try actually profiling the extra time spent?

Despite that speed is not the critical concern (asymmetric value spaces are), UTF-8 must guard against invalid byte sequences, while WTF-16, where all possible values are valid as long as byte length is a multiple of 2, does not. In practice, the guard in UTF-8 is part of the copy loop over a boundary, typically from untyped memory to untyped memory, while WTF-16 can indeed just memcpy. Unless SIMD can be utilized, the difference is about that of a loop over a load into a branch vs. a memcpy, in case this helps to quantify. Expect an additional final memcpy if the UTF-8 copy should fail before storing anything to the receiver's memory.

Perhaps this is missing some necessary context. Note that the threads happened before a resolution, and have been created a few days before using them as an argument in Wasm. There was and still is no such design principle, because it doesn't make sense. Similarly, the arguments in the thread referenced are nonsense. JSON and CSS modules are files, which have different requirements than API calls. importScript the same, loads source code. Also note that JSON actually preserves idiomatic JS strings in data (APIs) through escape sequences, even though it stores as UTF-8 (files). Preserving in JSON makes sense, since sometimes JSON.stringify/parse are used for things like synchronous IPC, where maintaining integrity is critical. The Component Model should do the same, but refuses. The others are networking APIs, where UTF-8 is common. These are asynchronous and typically untrusted, where the protocols mandate UTF-8, and not maintaining synchronous state is much less problematic there. However, mutating string data as a side-effect of a normal function call is nothing less than a hazard, since some strings then seemingly randomly won't compare equal anymore after a call and stuff like that. WTF-16 (what JS effectively specifies) -> UTF-8 is lossy. The people in the threads know that very well, but keep bringing up the same already debunked arguments over and over again nonetheless to get their way. There, the thread suggests to encourage UTF-8 for new JavaScript APIs as well, which plays into the desires on the Wasm end yet is well-known to be impossible to pull off in JS. Applying this to JS conflicts with the ECMAScript specification, because JS has the same hard backward-compatibility constraints as Java, Dart, Kotlin, C# and other languages that evolved from UCS-2 to WTF-16. None of these languages can change their string semantics, in particular not to something akin to UTF-8, since it's semantically more restrictive and hence would break execution of existing and, arguably, all future code using idiomatic APIs like substring without being aware of potential mutation. It's subtle, I admit, but given that the arguments are factually invalid, the threads can only be one of two things: Incompetence or dishonesty. As always in political contexts, the mere mortal wonders what's better. Given foregoing discussions, where the same people participated, I would rule out incompetence. Now go there and question, and always the same gate keepers show up, simulating responses in good faith. Killing you with kindness, or however that's called. Dare to be unimpressed and follow-up, and someone quick-draws a CoC. That's why I decided to try something new, there pinging various people from the TAG, in the hope to finally get eyes on this behavior by someone knowledgeable, which obviously failed as well. Not sure if that helps, but that's some of the background :)

FWIW, here's the presentation I wanted to give to the Wasm CG that explains the details and pitfalls in an easier to digest way: https://www.youtube.com/watch?v=Ri2NMnSQo4o

It is possible to specify new APIs that say "UTF-8 only, if you pass an unpaired surrogate, you will get an error", and many such APIs already behave that way. They are, on the whole, not a major problem in practice. They are not not fundamentally incompatible with JavaScript/Java/Dart/Kotlin/C# -- it just means that if you wish to call an API that only accepts UTF-8, you must make sure your inputs are valid UTF-8 -- the only lossy case is for invalid Unicode strings, likely generated by accident. It is not dishonest to want to add APIs that behave that way.

It's fine to disagree with me or the committee, but your grand gesturing and your overstatements about how tightening a single bolt on strings will break web compatibility forever is exhausting to listen to, especially when you claim large-scale political conspiracy and use words like "fundamentally incompatible with JavaScript". I don't see any of it.

Your behavior in those threads are absurd, unnecessary, and alarmist, and I really don't have any sympathy for you. Even this reply doubles down on the over-exaggeration.

I think large parts of WebAssembly are mismanaged. I have major complaints about the velocity, instability, and web APIs, I spend a lot of time in them, I'm grumpy, and I'm not usually one to go to bat for any of this. Even within the WebAssembly/JavaScript/WASI interop, there are 20 things I'd put on the list ahead of this. If I have any advice for you, it's to pick a new battle, because this is maybe this is the highest complaint to lowest impact ratio I've ever seen. You lost, just move on.

Allow me to focus on the technical arguments, that I think fall short. Sure, one can go and make a second string type, or a bunch of throwing APIs. I'd question that this actually improves a language in a tangible way, or that anyone would want that for a rational reason that is not induced from the outside. When not doing so, it's incompatible in the sense of the word. Whether incompatibility isn't much of a deal depends, I guess. For someone not having a respective use case, perhaps, but for someone else having exactly that use case, say hashing substrings to then discover unexpected collisions, or streaming 1K chunks of strings over component boundaries, then discovering mojibake after concatenating, it might very well be significant, or even expensive. I mean, there are good reasons all those languages try the best they can to prevent that in their native habitats. What amazes me is that all that came to be because someone has formulated a desire, that could easily be fulfilled in addition with a boolean flag for W/UTF, but refuses to include such a trivial compromise, which surprisingly has more weight than any evidence, or precedents like WebIDL, JSON, or the various language standards. I find this highly concerning, since it conflicts with my understanding of responsible engineering. Also conflicts with Wasm's communication, that literally states that Wasm executes in the same semantic universe as JavaScript, and maintains backwards-compatibility with the Web. Perhaps, if there is something fruitful to spin a narrative around, then that these decisions undermine the exact value proposition of AssemblyScript, that was supposed to be used in tandem/closely with JavaScript, which now becomes risky on the fundamental level of the most prominent higher-level data type, strings. Plus, of course, when two AssemblyScript components communicate. That makes these string decisions particularly unfortunate for me personally after having spent all that time and effort, working towards Wasm's goals in good faith, perhaps explaining my persistence on the matter. Quite a dilemma.

Sure, there are technical arguments for this approach, but there are also technical arguments for "the strings in our strings API should really be valid Unicode strings". I have no horse in this race and I have no preference, but I do see both options as completely valid.

The problem is when you say things like people that prefer the latter approach "can only be either dishonest, or incompetent". Putting it kindly, you're basically only making enemies at that point, and you seem unwilling to consider other points of view, at best. You seem absolutely baffled about why your tone, phrasing, and language are making others uncomfortable, even as you continue to insult those you're trying to influence.

I have never met you before this conversation, and I came away with a very negative impression. There are reasons you aren't being listened to, and they are problems with you and your behavior, not grand conspiracies.

There are battles worth staking your entire professional reputation over -- the GC repo is full of people doing that -- but this is definitely not one of them.

Well, I tried. Anyway, even if I was the abhorrent monster you keep painting in your almost exclusively ad hominem argumentation while accusing me of what you are undoubtedly guilty of yourself, I'd argue that none of this justifies plain ignoring technical concerns in a standardization effort. This exchange is an almost perfect reflection of the practices prevalent in the Wasm CG, that made the Component Model, and likely other things elsewhere, possible almost uncontested. And surely this is deliberate abuse, and I hope people can see that. And coincidentally, that's exactly my critique. I hope nobody is surprised that being at the receiving end of this, despite your best efforts, for years, is an extraordinarily frustrating experience, and that this is exactly the point.

> It seems most of the complaints are that selecting UTF-8 as a primary string encoding is "against the practices of the web"

And by "against the practices of the web" they really mean against the practices of Java/JavaScript. But I thought that was the whole point of WASM?