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Followup to bug 326506 -- this comment got lost somehow.
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@ -178,18 +178,26 @@ interface nsIPrincipal : nsISerializable
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* principal. Principals are equal if they are the same object, they
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* have the same origin, or they have the same certificate ID.
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*
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* Thus a principal subsumes itself if it is equal to itself.
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* Thus a principal always subsumes itself.
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*
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* The system principal subsumes itself and all other principals except
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* the non-principal.
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* The system principal subsumes itself and all other principals.
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*
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* The non-principal is not equal to itself or any other principal, and
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* therefore does not subsume itself.
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* A null principal (corresponding to an unknown, hence assumed minimally
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* privileged, security context) is not equal to any other principal
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* (including other null principals), and therefore does not subsume
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* anything but itself.
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*
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* Both codebase and certificate principals are subsumed by the system
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* principal, but no codebase or certificate principal yet subsumes any
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* other codebase or certificate principal. This may change in a future
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* release; note that nsIPrincipal is unfrozen, not slated to be frozen.
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*
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* XXXbz except see bug 147145!
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*
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* Note for the future: Perhaps we should consider a certificate principal
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* for a given URI subsuming a codebase principal for the same URI? Not
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* sure what the immediate benefit would be, but I think the setup could
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* make some code (e.g. MaybeDowngradeToCodebase) clearer.
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*/
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[noscript] boolean subsumes(in nsIPrincipal other);
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