- a major behavioral change to collection-based backrefs: they no

- a major behavioral change to collection-based backrefs: they no
longer trigger lazy loads !  "reverse" adds and removes
are queued up and are merged with the collection when it is
actually read from and loaded; but do not trigger a load beforehand.
For users who have noticed this behavior, this should be much more
convenient than using dynamic relations in some cases; for those who
have not, you might notice your apps using a lot fewer queries than
before in some situations. [ticket:871]