mongoexport creates a json with type information, but longs get converted to integers when mongoimport reads data back in

This is a problem for java, where types matter.

Create a long
> db.export.insert(

{longNum:NumberLong(123)}

)

mongoexport --collection export > export.json
mongoimport --collection import < export.json

In a mongo shell, look at the export and import collections
> db.import.find()

{ "_id" : ObjectId("54136bda945c5f71c6d2897f"), "longNum" : 123 }

> db.export.find()

{ "_id" : ObjectId("54136bda945c5f71c6d2897f"), "longNum" : NumberLong(123) }

The import collection shows the number as in integer instead of a long. The export.json does show the longNum being exported as a $numberLong but the importer fails to respect that.