anchor.diff:      }
   	
       static Map decryptNamedArguments(Map params){
  -      if(params.isEmpty) return {};
         Map<String,dynamic> o = new Map<String,dynamic>();
  +      if(params.isEmpty) return o;
         params.forEach((k,v){
           if(k is String) o[k] = v;
   		else o[Hub.decryptSymbol(k)] = v;
  
positive.code: 
  class Hub{
  		
  	static final symbolMatch = new RegExp(r'\(|Symbol|\)');
  	
  	static dynamic throwNoSuchMethodError(Invocation n,Object c){
  
negative.code: 	}
  		
      static Map encryptNamedArguments(Map params){
        Map<Symbol,dynamic> p = new Map<Symbol,dynamic>();
        if(params.isEmpty) return p;
        params.forEach((k,v){
          if(k is! Symbol) p[Hub.encryptSymbol(k)] = v;
          else p[k] = v;
  