Perhaps for bug report tests, but shouldn't API tests really be kept in sync as the driver changes? IMO, `mongocollection-createdbref-001.phpt` is the test for passing arguments to `MongoCollection::createDBRef()`, which should not cause errors.

Anyway, I can concede the point for other tests, but since I only created this a week prior in the master branch (and in a *very* related issue), I'm going to insist on revising it here.