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When you run something like this it fails to deserialize the WriteResult on the client (shell):
> db.eval(function(){return db.nothing.update({fake:1},{$set:{a:1}})})
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2014-04-21T08:56:42.415-0400 ReferenceError: writeConcern is not defined
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> var res = db.eval(function(){return db.nothing.update({fake:1},{$set:{a:1}})})
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>s res.nInserted
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0
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> res.tojson()
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2014-04-21T08:58:49.077-0400 ReferenceError: singleBatchType is not defined
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// converting to json from WriteResult works much better.
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> db.eval(function(){return db.nothing.update({fake:1},{$set:{a:1}}).tojson()})
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{ "nMatched" : 0, "nUpserted" : 0, "nModified" : 0 }
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This is probably due to the fact that most of the types are defined in an enclosure and not public, but more investigation should be done.
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