Description
> doc = db.test.findOne()
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{ "_id" : ObjectId("52857640a3461b18bcb33e3b"), "nums" : [ 1, 2, 3 ] }
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> db.test.find()
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{ "_id" : ObjectId("52857640a3461b18bcb33e3b"), "nums" : [ 1, 2, 3 ] }
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