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EvenFinerGrainedPermissions

-              v3
+              v4
+== Performance ==
+Even today, lots of permission checks and lots of policies could have a non-negligible performance impact.
+If we're going to add even more checks like suggested here, we will also need a somewhat more efficient infrastructure for performing those checks.
+A few ideas:
+ - policy registration: each `IPermissionPolicy` can register "patterns" of actions, resources and users it is interested in; only fire the permissions that matches. Of course, there's a balance to find, and the pattern matching should not "cost" more than firing the rule. Also, determination of group membership should be cached when possible.
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