Objectmapper: Problem with float values after update to Swift 4.1 Xcode 9.3

Hi, I was using a mappable model like this

struct BalanceData: Mappable {

    var balance = Float()

    init?(map: Map){
    }

    mutating func mapping(map: Map) {
        balance     <- map["balance"]
    }

}

And this is the response I am parsing into that model

{
  "status": 200,
  "message": "OK",
  "error": "",
  "data": {
    "balance": 797.76
  }
}

This was working just great until I update to Xcode 9.3 and macOS High Sierra this morning.
Now BalanceData.balance is getting 0 instead of 797.76, I have to change var balance = Float() to Double() in model in order to get the correct value.