anchor.diff:    @override
     Handler get handler => function;
   
  -  const HttpFunctionEndPoint(String target, this.function) : super(target);
  +  const _HttpFunctionEndPoint(String target, this.function) : super(target);
   }
   
  -class CloudEventFunctionEndPoint extends FunctionEndpoint {
  +class _CloudEventFunctionEndPoint extends FunctionEndpoint {
     final CloudEventHandler function;
   
     @override
  
positive.code:   const FunctionEndpoint(this.target);
  
    const factory FunctionEndpoint.http(String target, Handler function) =
        HttpFunctionEndPoint;
  
    const factory FunctionEndpoint.cloudEvent(
      String target,
      CloudEventHandler function,
    ) = CloudEventFunctionEndPoint;
  }
  
  class HttpFunctionEndPoint extends FunctionEndpoint {
    final Handler function;
  
    @override
  
negative.code:   @override
    Handler get handler => wrapCloudEventFunction(function);
  
    const _CloudEventFunctionEndPoint(String target, this.function)
        : super(target);
  }
  