title: Using fabsf on CGFloats shows a warning
body: <p>I'm trying to get the absolute value of a CGFloat parameter but I'm getting the following warning:</p>
  
  <blockquote>
    <p>Absolute value function 'fabsf' given an argument of type 'CGFloat' (aka 'double') but has parameter of type 'float' which may cause truncation of value</p>
  </blockquote>