     }
 
 }
-

        return format(UInt64(count), sourceUnit: sourceUnit, targetUnitType: targetUnitType, formatter: formatter)
    }
    
    static func format(count: UInt, sourceUnit: BitUnit = .Bit, targetUnitType: BitUnitType = .DecimalBitUnit, formatter: NSNumberFormatter = defaultFormatter) -> String? {
        guard count >= 0 else {
            return nil
        }
        return format(UInt64(count), sourceUnit: sourceUnit, targetUnitType: targetUnitType, formatter: formatter)
    }
    

        return convert(UInt64(count), from: from, to: to)
    }
    
    static func convert(count: UInt, from: BitUnit, to: BitUnit) -> UInt64 {
        return convert(UInt64(count), from: from, to: to)
    }
    
