+* more and better test cases (use git fast-import to speed up creation)
+
+* large mbox/Maildir/MH/NNTP spool import (see PublicInbox::Import)
+
+* Optionally allow indexing Xapian without positional information to
+ save space (but prevents "quoted phrase" searching).
+
+* Allow NNTP and more of PSGI code to work without Xapian
+
+* Read-only WebDAV interface to the git repo so it can be mounted
+ via davfs2 or fusedav to avoid full clones.
+ davfs2 needs Range: request support for this to be feasible:
+ https://savannah.nongnu.org/bugs/?33259
+ https://savannah.nongnu.org/support/?107649
+
+* Contribute something like IMAP IDLE for "git fetch".
+ Inboxes (and any git repos) can be kept up-to-date without
+ relying on polling.