nl_tokens: SetterObservable s call a function when set . Their getter is backed up by an observation .
pl_tokens: function SetterObservable ( getter , setter ) { this . setter = setter ; this . observation = new Observation ( getter ) ; this . handler = this . handler . bind ( this ) ; //!steal-remove-start if ( process . env . NODE_ENV !== 'production' ) { canReflect . assignSymbols ( this , { "can.getName" : function ( ) { return ( canReflect . getName ( this . constructor ) + "<" + canReflect . getName ( getter ) + ">" ) ; } } ) ; <mask> . defineProperty ( this . handler , "name" , { value : canReflect . getName ( this ) + ".handler" } ) ; } //!steal-remove-end }