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SpiderMonkey: JS -> BSON is correct, but not BSON -> JS
V8: I think both are broken

That test passes on SM but this fails:

> db.foo.drop()
true
> db.foo.insert({key:'adsf\0asdf'})
> db.foo.findOne()
{ "_id" : ObjectId("5016cec9eee3e47040cf29dd"), "key" : "adsf" }

Note that it is written to the db correctly and readable by pymongo:

In [5]: db.foo.find_one()
Out[5]: {'_id': ObjectId('5016cec9eee3e47040cf29dd'), 'key': 'adsf\x00asdf'}

is duplicated by

SERVER-3614 strings with embedded nulls cannot be retrieved correctly

SERVER-6556 aggregation Value does not handle string values with null characters properly

SERVER-5462 Shell doesn't handle embedded nulls correctly

SERVER-12756 Mongo shell not handling \u0000 correctly

is related to

SERVER-2407 Switch to v8