title: Is or Are to prefix boolean values
body: <p>When naming a boolean, or a function returning a boolean it's usual to prefix with 'is' e.g.</p>
  
  <ul>
  <li>isPointerNull</li>
  <li>isShapeSquare</li>
  </ul>
  
  <p>What about when refering to multiple items, should it be:</p>
  
  <ul>
  <li>arePointersNull or isPointersNull</li>
  <li>areShapesNull or isShapesNull</li>
  </ul>
  
  <p>I can see arguments for both; is offers consistency and perhaps slightly better readability, are makes the code read in a more natural way.</p>
  
  <p>Any opinions?</p>