title: AngularJS Expression Concatenating Instead of Adding
body: <p>I have the following 2 expressions in my HTML (as the param for a controller function called within the ngClick directive), where I am trying to implement simple paging functionality:</p>
  
  <p><code>{{ (currentPage|number)+(1|number) }}</code> - This concatenates the two values together as if they were a string.</p>
  
  <p><code>{{ (currentPage|number)-(1|number) }}</code> - This calculates the correct and expected numeric result.</p>
  
  <p>Any idea what the problem is here?  I have tried various ways to add a literal and AngularJS value together to no avail.  I am using version 1.2.0.</p>
  
  <p>Thanks in advance!</p>