[Webkit-unassigned] [Bug 78777] New: Numerous trivial bugs in Object.defineProperty

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=78777

           Summary: Numerous trivial bugs in Object.defineProperty
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: barraclough at apple.com


There are a handful of really trivial bugs, related to Object.defineProperty:
    * Redefining an accessor with different attributes changes the attributes, but not the get/set functions!
    * Calling an undefined setter should only throw in strict mode.
    * When redefining an accessor to a data decriptor, if writable is not specified we should default to false.
    * Any attempt to redefine a non-configurable property of an array as configurable should be rejected.
    * Object.defineProperties should call toObject on 'Properties' argument, rather than throwing if it is not an object.
    * If preventExtensions has been called on an array, subsequent assignment beyond array bounds should fail.
    * 'isFrozen' shouldn't be checking the ReadOnly bit for accessor descriptors (we presently always keep this bit as 'false').
    * Should be able to redefine an non-writable, non-configurable property, with the same value and attributes.
    * Should be able to define an non-configurable accessor.
These are mostly all one-line changes, inverted boolean checks, masking against wrong attribute, etc.

Fixing these would resolve about 80% of our outstanding test-262 failures.

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