[Webkit-unassigned] [Bug 285254] New: [JSC] `Array.prototype.toReversed` should fill holes with undefined

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=285254

            Bug ID: 285254
           Summary: [JSC] `Array.prototype.toReversed` should fill holes
                    with undefined
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aosukeke at gmail.com

https://commits.webkit.org/287431@main rewrote `Array.prototype.toReversed`
    in C++. According to the spec[1], `toReversed` should fill holes with `undefined`,
    but this C++ implementation sometimes leaves those holes intact.

    This commit fixes that issue by making the function bail out from the fast path
    when the array contains any holes.

    [1]: https://tc39.es/ecma262/#sec-array.prototype.toreversed

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