Bug 274974 – [JSC] `fractionalDigits` of `Intl.DurationFormat` should be treated as at most 9 digits if it is omitted

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

[Sosuke Suzuki]

According to the spec[1], if the `fractionalDigits` option of `Intl.DurationFormat` is omitted, it
    should be treated as at most 9 digits. However, in the current JSC, it is treated as exact 0 digits.
    
    The README of the proposal repository[2] states the following:
    > If this option is omitted, only nonzero decimals will be displayed and trailing zeroes will be omitted.
        
    [1]: https://tc39.es/proposal-intl-duration-format/#sec-partitiondurationformatpattern ( 4.f.ii.1.b )
    [2]: https://github.com/tc39/proposal-intl-duration-format#parameters

[Sosuke Suzuki]

Pull request: https://github.com/WebKit/WebKit/pull/29380

[EWS]

Committed 279632@main (d0e99dfc02ab): <https://commits.webkit.org/279632@main>

Reviewed commits have been landed. Closing PR #29380 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/129145390>