title: What is the purpose of null?
body: <p>I am in a compilers class and we are tasked with creating our own language, from scratch. Currently our dilemma is whether to include a 'null' type or not. What purpose does null provide? Some of our team is arguing that it is not strictly necessary, while others are pro-null just for the extra flexibility it can provide.</p>
  
  <p>Do you have any thoughts, especially for or against null?
  Have you ever created functionality that required null?</p>