Swift 3 , Double -> Decimal rounding error?

I'm having an issue when I convert a double to a decimal:

import Foundation
var double:Double = 0.23
var decimal = Decimal(double)
print(double)
print(decimal)

Line 4 will print out 0.23 which is the value i've set.

however, line 5 prints out "0.2300000000000000512"

Why is this happening? I

It works correctly if I do this:

var double:Double = 0.23
Decimal.init(string:double.description)