title: JavaScript assoc array with negative int keys
body: <p>I don't seem to be able to define something like:</p>
  
  <pre><code>var a = {-1: 'Apple', -2: 'Orange'}
  </code></pre>
  
  <p>my Safari complains about a <code>syntax error near '-'</code>. Parens don't help either, i.e. <code>{(-1): ...</code> - in that case Safari doesn't like the opening paren.</p>
  
  <p>If I want the keys to be just ints, not strings, what is the proper way of constructing an assoc array, if any?</p>