code: function next() {
  		if ( count === len ) {
  			debug( 'Finished all queries.' );
  			out.meta.success = scount;
  			out.meta.failure = fcount;
  			return clbk( null, out );
  		}
  		if ( idx < len ) {
  			debug( 'Querying for package: `%s` (%d)...', pkgs[idx], idx );
  			request( pkgs[idx], opts, onResponse( pkgs[idx], idx ) );
  			idx += 1;
  		}
  	}
docs: FUNCTION: next()
  Requests package data for the next package in the queue. Once requests for all desired packages have completed, invokes the provided callback.
  
  @private
  @returns {Void}