Bug 277942 – [JSC] Parse a critical flag on TZ annotation for Temporal

• Status: RESOLVED
• Resolution: FIXED
• Component: JavaScriptCore

[Sosuke Suzuki]

RFC 3339[1] and RFC 9557[2] allows that bracketed timezone annotations include a critical flag(!)[3].
    It indicate that the parsing should be rejected if there is a conflict between the offset and the
    timezone annotation.
    
    Temporal API has added this feature into the spec[4]. While the critical flag does not affect the
    behavior of Temporal, parsing must still succeed.
    
    Currently, JSC throws an error when creating a Temporal object from a string that includes a
    critical flag.

    [1]: https://www.rfc-editor.org/rfc/rfc3339
    [2]: https://www.rfc-editor.org/rfc/rfc9557
    [3]: https://www.rfc-editor.org/rfc/rfc9557.html#name-inconsistent-time-offset-an
    [4]: https://github.com/tc39/proposal-temporal/pull/2397

[Sosuke Suzuki]

Pull request: https://github.com/WebKit/WebKit/pull/32028

[EWS]

Committed 282211@main (380f93b87d14): <https://commits.webkit.org/282211@main>

Reviewed commits have been landed. Closing PR #32028 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/133802376>