Andy,

  1. I am pelase that JSON result objects are mapped to JavaScript objects.  Are undefined values handled (e.g. XQuery () vs JavaScript undefined)? 
  2. I am using basex-node and having trouble binding objects in a query.  I would like to have the object result in an XQUERY map.  It would be nice if undefined values as defined above are handled as well.  For now I have to do something like this'$x := map ' +JSON.stringify(obj).replace('undefined', '()').
I hope this make sense.