[Webkit-unassigned] [Bug 163160] New: Object.freeze() and seal() should throw if [[PreventExtensions]]() fails.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=163160

            Bug ID: 163160
           Summary: Object.freeze() and seal() should throw if
                    [[PreventExtensions]]() fails.
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mark.lam at apple.com

See https://tc39.github.io/ecma262/#sec-object.freeze and https://tc39.github.io/ecma262/#sec-setintegritylevel.  If O.[[PreventExtensions]]() returns false, we should throw a TypeError but currently does not.

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