nl_tokens: Returns the object s keys .
pl_tokens: function keys ( o ) { if ( o === undefined || o === null ) return [ ] ; var keys = getKeys ( o ) , idx ; if ( libs . object . isArguments ( o ) ) { idx = <mask> . indexOf ( 'length' ) ; if ( idx > - 1 ) keys . splice ( idx , 1 ) ; } return keys ; }