[Webkit-unassigned] [Bug 275745] New: [JSC] `Intl.DurationFormat` nfOptions.roundingMode for seconds / microseconds / nanoseconds should be "trunc"

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=275745

            Bug ID: 275745
           Summary: [JSC] `Intl.DurationFormat` nfOptions.roundingMode for
                    seconds / microseconds / nanoseconds should be "trunc"
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aosukeke at gmail.com
                CC: sabouhallawa at apple.com

```
const duration = {
  seconds: 1,
  milliseconds: 500,
};

function sameValue(a, b) {
  if (a !== b) {
    throw new Error(`expected ${b} but got ${a}`)
  }
}

const df = new Intl.DurationFormat("en", { seconds: "numeric", fractionalDigits: 0 });

sameValue(df.format(duration), "1"); // but got "2" since we use "rounding-mode-half-up"

```

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