Advance to stage 4

[gibson042]

Criteria taken from the TC39 process document minus those from previous stages:

• Test262 acceptance tests have been written for mainline usage scenarios, and merged

tc39/test262#4682

• Two compatible implementations which pass the acceptance tests

• JavaScriptCore
• SpiderMonkey
• V8

• Significant in-the-field experience with shipping implementations, such as that provided by two independent VMs

• A pull request has been sent to https://github.com/tc39/ecma262 with the integrated spec text

tc39/ecma262#3714

• All ECMAScript editors have signed off on the pull request

[slavafomin]

Hello!

Thank you for this proposal. The ability to properly parse BigInt values is pretty important for the Web 3.0 developers community. Are there any estimates when this will be implemented?

[gibson042]

@slavafomin I'm planning to unblock implementations by merging #41 soon, and hopefully to advance to Stage 4 in March.

[ljharb]

Webkit PR: WebKit/WebKit#7057

[Constellation]

JSC implementation gets landed now.

[zloirock]

It's supported by all popular engines for a long time.

Usually, proposals moves into stable language earlier. Maybe it's time to advance the proposal forward?