[Webkit-unassigned] [Bug 30996] New: `localStorage.setItem` can overwrite `localStorage` methods

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=30996

           Summary: `localStorage.setItem` can overwrite `localStorage`
                    methods
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kangax at gmail.com


It's currently possible to overwrite methods of `localStorage` simply by
setting values of same-named keys through `setItem`:

localStorage.setItem('clear', 'x'); 
localStorage.clear; // "x", not original "clear" method.

This is rather destructive and probably shouldn't happen. Mozilla, for example,
allows to overwrite methods of `localStorage` but only through direct accessors
(localStorage.clear = 'x'). Using getItem/setItem allows to use any key and not
worry about one of them overwriting actual `clearStorage` method.

This still happens in r50383.

Thank you.

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