When running 'validate' against a collection in a sharded system the top level of the output document should have a 'valid' field. Currently drivers have to iterate through the subdocuments of 'raw' checking if each individual shard is valid. This becomes even more complicated when one shard has 1.8 members and another has 1.9 members since the <= 1.8 members don't return a 'valid' field at all.