title: What's the best practice for an "n/a" result when it would normally be a boolean value?
body: <p>I'm working on an api that provides JSON responses. One of the items is typically a bool, but in some cases, it is "n/a".</p>
  
  <p>The two options I'm considering are:</p>
  
  <ol>
  <li>Returning a string like "N/A"</li>
  <li>Returning a value of null</li>
  </ol>
  
  <p>The first option is "truthy" though and if someone implemented the API poorly, it could result in a false positive (although it's a little more clear to a human reader). The second result is "falsey" but doesn't really provide the same clarity to a human reader of the result.</p>