[whatwg] Something better than DOM_QUOTA_ERROR when LocalStorage is immutable?

[Jeremy Orlow]

*Please, keep this on topic.  There's no point to rehashing
http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2009-April/019238.htmlor
any of the other similar debates on private browsing and
localStorage's
persistence guarantees.*

When in "private browsing" mode, WebKit should not write any data to the
hard drive.  In addition, WebKit
does not allow changes to localStorage that aren't going to be written to
disk.  Currently, it returns a DOM_QUOTA_ERROR on setItem when private
browsing is enabled, and silently fails for removeItem and clear.  The
silent failures are obviously bad, but even the (ab)use of DOM_QUOTA_ERROR
kind of bothers me.

Is there an exciting exception that'd work better to tell the script "the
change failed because localStorage is currently immutable"?  If not, is
there any chance it could be added to the spec?

Obviously only browser vendors that share WebKit's philosophy on
localStorage's "guarantee" of persistence would actually use this, but I
think it'd be far better than the current behavior.

Thanks,
Jeremy
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