[Webkit-unassigned] [Bug 275489] New: [JSC] Fix `Intl.DurationFormat` for `numeric` and `2-digit`

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=275489

            Bug ID: 275489
           Summary: [JSC] Fix `Intl.DurationFormat` for `numeric` and
                    `2-digit`
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aosukeke at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

In the current JSC `Intl.DurationFormat` implementation, only units with a value that is not 0 or a
    display setting that is not `auto` are formatted. However, this behavior is incorrect according to
    the current spec[1]. When a unit's style is `numeric` or `2-digit` (i.e., the unit is `hours`,
    `minutes`, or `seconds`), it needs to be formatted even if its value is 0 and its display is set to
    auto. For example, consider the following code:

    ```
    const df = new Intl.DurationFormat("en", { hours: "numeric", minutesDisplay: "auto", secondsDisplay: "auto" });
    print(df.format({ hours: 0, minutes: 0, seconds: 1 }));
    ```

    This code is expected to output `0:00:01`, but the current JSC outputs `0, 01`. Only the hours and
    seconds are displayed, while the minutes are not. Additionally, the separator `:` is not used; instead,
    `,` is outputted.

    [1]: https://tc39.es/proposal-intl-duration-format/#sec-partitiondurationformatpattern

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