Clean up the internal `has` function.
Clean up the internal `has` function.

cyril-sf/kamino.js,yetone/json3,bestiejs/json3,mcanthony/json3,jcoc611/cassandraMAP,mcanthony/json3,bestiejs/json3,tildeio/kamino.js,yetone/json3,jcoc611/cassandraMAP