[Pharo-project] MongoTalk

Hi! These days I've been playing around with MongoDB and it was a nice surprise to discover the availability of a Smalltalk driver: MongoTalk. When I tried to install it on Pharo v1.3, however, every test failed because of a message sent to a nonexistent class. This class was GRCodec, if I recall well. Does anyone know something about this? Thanks in advance! Lucio