How to return float value with zero fraction in MongoDB? -

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i trying retrieve float values mongodb 0 fraction. doesn't work expect to.

i.e. inserted doc:
db.collection.insert({ _id: 1, floatval: 10.0 })

while retrieving gives as: 

{         "_id": 1,         "floatval": 10     }

whereas want result as: 

{         "_id": 1,         "floatval" : 10.0     }


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