[Webkit-unassigned] [Bug 282504] `new Intl.Locale('und').language` returns `undefined`, not string `'und'`

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=282504

--- Comment #2 from lionel.rowe at gmail.com ---
(In reply to Yusuke Suzuki from comment #1)
> This is ICU issue around "und" support.

Apologies for ignorance, this is my first bug report here. Do you mean it's an issue in ICU itself? Or it's relating to a preexisting issue against WebKit's ICU implementation? Or something else?

I don't think it can be an issue in ICU itself, as ICU doesn't specify how implementations should _represent_ the various semantics (i.e. there's nothing in ICU that says an "und" locale shouldn't be represented as having a nullish "language" field). The problem is rather that ECMA-402 specifies that `GetLocaleLanguage` should return the language subtag unchanged.

>From a userland perspective, I first encountered this bug by creating `new Intl.Locale('und')` and noticing that its `language` was `undefined`, then noting that the TypeScript types appeared to be wrong. But upon checking the spec, I realized it was the implementation that was wrong, not the TS types.

![TypeScript logo superimposed over Seymour Skinner's face: "Am I out of ~~touch~~ spec?" "No, it's the ~~children~~ implementations who are wrong!"](skinner.jpg)

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