Expose underlying BSON types from MongoJS (#10)
Expose underlying BSON types from MongoJS (#10)

These are necessary if you want to do things like use literal ObjectIds in your code.

For example, this solutions on StackOverflow is possible with MongoJS but not with then-mongo:
http://stackoverflow.com/questions/21076460/how-to-convert-a-string-to-objectid-in-nodejs-mongodb-native-driver

Implementation mostly lifted from MongoJS:
https://github.com/mafintosh/mongojs/blob/master/index.js
then/mongod,then/then-mongo