Need explanation about random function swift

Got a question about my random function: why is it giving this error?

'4294967295' is not exactly representable as 'Float'; it becomes '4294967296'

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my code is

func random() ->CGFloat {
    return CGFloat(Float(arc4random()) / 0xFFFFFFFF)
}
func  random(min: CGFloat, max: CGFloat) -> CGFloat {
    return random() * (max - min) + min
}

it doesn't change the functionality of the application but it just appeared out of nowhere.

thanks in advance!