title: Store hexadecimal integers in byte array in Swift (retaining hex format)
body: <p>I have to send a byte array of hexadecimal integers to a BLE devise. Whenever I try to use <strong>0x</strong> notation the internal value stored in the byte array is getting converted to a decimal value. </p>
  
  <p><code>var foo : [Byte] = [0xff, 0xD9]</code> is actually stored as <code>[255, 217]</code></p>
  
  <p>What data structure should I be using to make it stay in hex format ? </p>