[Webkit-unassigned] [Bug 133912] New: Dictionary with attribute set to 'undefined' counts as set but shouldn't

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=133912

           Summary: Dictionary with attribute set to 'undefined' counts as
                    set but shouldn't
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Bindings
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: krit at webkit.org
                CC: sam at webkit.org, oliver at apple.com, rniwa at webkit.org


If an object has something like { x: undefined }, then the attribute x should count as unset. Instead it is set and can lead to wrong results. Example:

DOMPoint({x: undefined})

shouldn't set DOMPoint.x (so that it defaults to 0). With the bug, DOMPoint.x gets set to NaN. (Undefined on number -> NaN.)

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