'length' property of DateTime Format Function

[anba]

The 'length' property of the DateTime Format function returned from get Intl.DateTimeFormat.prototype.format changed from 0 to 1 in ECMA-402, 2nd ed.

In ECMA-402, 1st ed:

a. Let F be a Function object, with internal properties set as specified for built-in functions in ES5, 15, or successor, and the length property set to 0, that takes the argument date and performs the following steps:

In ECMA-402, 2nd ed:

a. Let F be a new built-in function object as defined in 12.3.4.
b. The value of F’s length property is 1.

The change is not listed in Annex B, so I'm not sure if it was intentional.

(V8 and SpiderMonkey still return 0, test262 also tests for 0 (https://github.com/tc39/test262/blob/master/test/intl402/DateTimeFormat/prototype/format/12.3.2_1_a_L15.js). Only JavaScriptCore already returns 1.)

[littledan]

I'm fine with the new semantics v2 semantics remaining in place for v3. V8 has changed the length of a whole bunch of functions for ES2015 compliance, and we haven't gotten a lot of web-compat-based pushback. So I'll be surprised if this ends up being an issue.

[bterlson]

Not concerned with changing length either.

[caridy]

Thanks you guys.

@anba do you want to send the PR? or should I take care of it? we are all running against time!

[anba]

@caridy Do we need any PR for ecma402? Unless I'm misunderstanding @littledan's answer, he's okay with the v2 change.

[caridy]

They are Ok with the change, but the change was not listed in the Annex B, maybe we should just add it there.

[anba]

Ah ok, I understand. It's probably better if you prepare a PR, because it's already a bit late in Europe. 😄