6.4.2
This patch release has the following minor changes:
- MONGOID-4539 #create_with attrs should not be used in where query
- MONGOID-4578 Fix Settable: allow setting a nested value to a non-string
- MONGOID-4608 Add Nor matcher
- MONGOID-4612 Map reduce with preference test failure
- MONGOID-4576 drop_dups: mark deprecated