title: GraphQL "not equal" operator?
body: <p>I have a GraphQl API for listing a bunch of items, and I can query it perfectly etc.
  But now I'd like to query for a subset of that list where one property can have 'all possible values except one specific one'.</p>
  
  <p>For example, I want to query something like this:</p>
  
  <pre><code>{
    items(status: !"Unwanted"){
      id
    }
  }
  </code></pre>
  
  <p>That exclamation mark obviously doesn't work, but it illustrates what I am after.
  Can't find any information about this online.</p>
  
  <p>Does anybody know of a way to do this?
  I would really hate having to enumerate all possible wanted values instead of just excluding the one unwanted value. This would be really bad design and is not scalable.</p>
  
  <p>Thanks.</p>