Order of keys in embedded document need to be enforced

Order of keys in embedded bson hashes in mongodb matters, so you can't $pullAll an embedded document if the order of keys is different from the one in mongodb:

code
{
_id: ObjectId('123'),
addresses: [

,

,
]
}
/code

then query like:

code
db.collection.update({_id: ObjectId('123')}, {$pullAll: {addresses: [

]}})
/code

would fail, because the order of keys ('zipCode', 'street') is different from the one stored in mongo ('street', 'zipCode'). More can be found here http://jira.mongodb.org/browse/SERVER-1914

Therefore, we need to force the order on every insert and update for consistency.