title: Arangodb document arrays vs key/value collection
body: <p>Are there limits to how many array values can be in a document other than document size? Arangodb can index into the arrays since version 2.8 so that's not a reason to go to a key/value collection format.</p>
  
  <p>E.g. 
  group document with member array:</p>
  
  <pre><code>{'_key': group1, members: [1, 2, 3, ...]} 
  </code></pre>
  
  <p>Is there a limit to how large the array members can be? Is it better to break this out in a key/value <code>{group: group1, member: 1}</code> collection for performance reasons?</p>