title: Hook changes to lineWidth on HTML5 canvas context
body: <p>I want to enforce a miterLimit in actual <em>pixels</em> rather than as a ratio of the lineWidth. To do this, I'd like to hook any changes to lineWidth, and set the miterLimit simultaneously and automatically. I've used custom setters on objects before, but if I replace the lineWidth setter, I don't know of any way to actually pass the value to set on through to the actual canvas context.</p>
  
  <p>Is there some way (compatible on IE9+) that I can <em>listen</em> to changes to a given key on an object without changing the <em>behavior</em> of setting that value?</p>