nl_tokens: Returns an object whose keys are changed properties and value is an [ oldProp newProp ] array .
pl_tokens: function ( ) { var oldData = <mask> ( this , '_data' ) , newData = get ( this , '_attributes' ) , diffData = { } , prop ; for ( prop in newData ) { diffData [ prop ] = [ oldData [ prop ] , newData [ prop ] ] ; } return diffData ; }