- conversion path: convert data only when needed
- conversion path: return formatsink to be used
- findpath: use distance queue
  - cross-objtype?
  - losses
  - distance
- hooks
  - after_new_change
  - before_commit
  - hook plugins
  - hook plg config
  - others?
- Make an autoconf macro: AC_OSYNC_PLUGIN
- `grep FIXME -r .`