title: Questions about GUID's: Are they always fixed in length, and is the middle number always 4?
body: <p>I just generated a few million GUID's turned them into a String and got the length... it was always the same.  Can I rely on this fixed length of the GUID when converting to String?</p>
  
  <p>Also, is the middle number of the GUID always "4" as shown in this screenshot?</p>
  
  <p><img src="https://i.stack.imgur.com/isj7i.png" alt="alt text"></p>