+Add symbol hiding so that we don't risk leaking any private symbols
+into the shared-library interface.
+
+Audit all libnotmuch entry points to ensure that all Xapian calls are
+wrapped in a try/catch block.
+
+Fix the "count" functionality to be exact as Olly explained in IRC:
+
+ ojwb> cworth: if you set the check_at_least parameter to the
+ database size, get_matches_estimated() will be exact
+
+Search syntax
+-------------
+Implement support for "tag:*" to expand to all tags.
+
+Fix "notmuch search to:" to be less confusing. Many users expect this
+to search for all messages with a To: header, but it instead searches
+for all messages with the word "to". If we don't provide the first
+behavior, perhaps we should exit on an error when a configured prefix
+is provided with no value?
+
+Support "*" in all cases and not just as a special case. That is, "* "
+should also work, as well as "* and tag:inbox".
+
+Implement a syntax for requesting set-theoertic operations on results
+of multiple searches. For example, I would like to do:
+
+ "tag:inbox" SET-SUBTRACT "tag:muted"