Add another TODO item

svn:r8480

doc/TODO

@@ -118,6 +118,9 @@ d     - Special-case localhost?
         - Cache answers client-side
         o Add to Tor-resolve.py
         - Add to tor-resolve
+    - Check for invalid characters in hostnames before trying to resolve
+      them.  (This will help catch attempts do to mean things to our DNS
+      server, and bad software that tries to do DNS lookups on whole URLs.)
 
   - Performance improvements