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+<a id="guard-spec.txt-TODO"></a>
+
+# Still non-addressed issues \[Section:TODO\]
+
+Simulate to answer:  Will this work in a dystopic world?
+
+Simulate actual behavior.
+
+For all lifetimes: instead of storing the "this began at" time,
+store the "remove this at" time, slightly randomized.
+
+Clarify that when you get a `<complete>` circuit, you might need to
+relaunch circuits through that same guard immediately, if they
+are circuits that have to be independent.
+
+Fix all items marked XX or TODO.
+
+"Directory guards" -- do they matter?
+
+```text
+       Suggestion: require that all guards support downloads via BEGINDIR.
+       We don't need to worry about directory guards for relays, since we
+       aren't trying to prevent relay enumeration.
+
+   IP version preferences via ClientPreferIPv6ORPort
+
+       Suggestion: Treat it as a preference when adding to
+       {CONFIRMED_GUARDS}, but not otherwise.
+```