title: NSPredicate, NsNumber numberWithFloat:0.0 (iPhone)
body: <p>hi i have Core Data database with numerical attributes. they are NSNumbers. Default value is 0.0 but when i try to do some NSPredicated fetch, i get "'NSInvalidArgumentException', reason: 'Invalid predicate: nil RHS'" just because attribute value is 0.0</p>
  
  <p>The predicate is created with: </p>
  
  <pre><code>[NSPredicate predicateWithFormat:@"(startValue =&gt; %@) AND (endValue &lt;= %@) AND (someId == %@)",startNSNumber,endNSNumber, idString]
  </code></pre>
  
  <p>how can i solve this problem ?</p>