[Webkit-unassigned] [Bug 170753] New: Implement Object.isFrozen() and Object.isSealed() per ECMA spec

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=170753

            Bug ID: 170753
           Summary: Implement Object.isFrozen() and Object.isSealed() per
                    ECMA spec
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: msaboff at apple.com

Our implementations for isFrozen() & isSealed() have special cases for JSFinalObjects that do not properly implement the semantics described in the ECMA standard.

The describes isFrozen() & isSealed() in terms of an abstract operation TestIntegrityLevel() <https://tc39.github.io/ecma262/#sec-testintegritylevel>.  We should implement TestIntegrityLevel() similar to how we implemented setIntegrityLevel() and use it for isFrozen() & isSealed().

<rdar://problem/31567008>

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