...which is a potential issue when using against authenticated 2.2.2 clusters (where GLE is required to be against the same database as the write operation). 2.3 and above use a different auth model, so the problem doesn't exist if newer mongoses/mongods are used. However, the problem should exist using the 2.4 client library against a 2.2 cluster.

(Note to reproduce on localhost an admin user is needed on the shards.)