nl_tokens: add child to data buffer and emit value
pl_tokens: function onChildAdd ( newData ) { // ignore all events before first read if ( ! started ) return ; // ignore already added item if ( data [ newData . key ( ) ] ) return ; // ignore older items that are not loaded if ( ! ended && ! data [ newData . <mask> ( ) ] && marker && newData . compareTo ( marker ) > 0 ) return ; return add ( newData ) . then ( emitValue ) ; }