Ms2ger

Spec text and tests are done in the proposal repo. Not sure if we need anything on the tools side. Given the restrictions to comment to this issue, I've created...

CG approved phase 4 in the 2020-05-12 meeting.

I'll try to review this week

I rebased the PR; it should now be straightforward to review. @tschneidereit, others: thoughts?

I'm not sure why it never landed. It seems like SpiderMonkey and JSC might implement the change already? I can try to find time to rebase.

Thanks for pointing this out, I'll try and take a look soon. I'd assume the ES spec prohibits Chromium's behaviour here, though there's some reference to "implementation distinguishable NaN value[s]"......

@syg perhaps this might be of interest to you too

There's a semi-automated script in this repo; getting it to be more automated would be nice.

`./test/sync-js-api.py`; it takes one argument which is the path of an up-to-date wpt clone.

cc @annevk Gecko code seems to be here: https://searchfox.org/mozilla-central/rev/f8db81665dc2833fff09dc7eef200539ac1fd351/dom/fetch/Fetch.cpp#1344 https://searchfox.org/mozilla-central/rev/f8db81665dc2833fff09dc7eef200539ac1fd351/dom/fetch/FetchUtil.cpp#674 We'd definitely need some tests for this