Shane F. Carr

I like the looks of this. The obvious question is, what happens when you pass a multi-code-point string? RangeError, or array of properties with length equal to the code point...

Discussion from 2021-09-09 TC39-TG2: https://github.com/tc39/ecma402/blob/master/meetings/notes-2021-09-09.md#lookupmatcher-should-retain-unicode-extension-keywords-in-defaultlocale Conclusion: OK to move forward with this change; review the final spec text when ready.

> Be aware that DefaultLocale may also have -u-nu. Say "en-US-u-nu-Latn" or "th-TH-u-nu-Thai" If we reach a situation where DefaultLocale has extension keywords (which it currently does not), then I...

What is the status on this?

@gibson042 Can you take a pass over the spec and enumerate any remaining topics that we should resolve based on this issue?

ICU MessageFormat is an industry standard, and as an ICU contributor, I have a certain affection for it. For Ecma 402, however, we need to put ICU MessageFormat up against...

@romulocintra In order to be most productive discussing this in the ECMA 402 meeting, it would help if someone could make slides or do some other legwork ahead of the...

As we start diving deep into the design here, we should articulate clearly what are the advantages of putting Intl.MessageFormat into the spec, rather than leaving it to user land....

Also, consider joining the [Message Format Working Group Google Group](https://groups.google.com/a/chromium.org/forum/#!forum/message-format-wg).

The proposal has reached Stage 1. https://github.com/tc39/proposal-intl-messageformat