Sessions's expiresAt is returned as a string instead of Date object #776

curl -X GET \
-H "X-Parse-Application-Id: some parse.com app id" \
-H "X-Parse-Master-Key: some parse.com master key" \
https://api.parse.com/1/classes/_Session/XXXXXXX

{
    "createdAt": "2016-01-03T00:45:43.417Z",
    "createdWith": {
        "action": "login",
        "authProvider": "facebook"
    },
    "expiresAt": {
        "__type": "Date",
        "iso": "2017-01-07T18:02:55.582Z"
    },
    "installationId": "f0743e6a-0fb3-c216-6dc5-3e0bc8ed34e7",
    "objectId": "DduCjDcmR7",
    "restricted": false,
    "sessionToken": "r:ERsvDtKakO7ApMZbCrHs8ZL7i",
    "updatedAt": "2016-01-08T18:02:55.594Z",
    "user": {
        "__type": "Pointer",
        "className": "_User",
        "objectId": "HQcObQVs2d"
    }
}

curl -X GET \
-H "X-Parse-Application-Id: some parse server app id" \
-H "X-Parse-Master-Key: some parse server master key" \
http://localhost:1337/1/classes/_Session/XXXXXX

{
    "objectId": "NJQZMpCRsx",
    "sessionToken": "r:1868be09b472699e68f554f5ad1ee527",
    "user": {
        "__type": "Pointer",
        "className": "_User",
        "objectId": "rQmfhg5yGB"
    },
    "createdWith": {
        "action": "login",
        "authProvider": "password"
    },
    "restricted": false,
    "expiresAt": "2017-03-02T02:26:28.312Z",
    "updatedAt": "2016-03-02T02:26:28.313Z",
    "createdAt": "2016-03-02T02:26:28.313Z"
}