[survey] Why HandlerFunc use value receiver instead of pointer

[at15]

Arise from #26

When looking at apex/log's code (which use a net/http like handler style instead of logrus like formatter writer style), found the handy util type HandlerFunc func... which also appears in net/http

https://golang.org/src/net/http/server.go#L1914

type Handler interface {
  	ServeHTTP(ResponseWriter, *Request)
 }

// The HandlerFunc type is an adapter to allow the use of
// ordinary functions as HTTP handlers. If f is a function
// with the appropriate signature, HandlerFunc(f) is a
// Handler that calls f.
type HandlerFunc func(ResponseWriter, *Request)

// ServeHTTP calls f(w, r).
func (f HandlerFunc) ServeHTTP(w ResponseWriter, r *Request) {
    f(w, r)
}

The question is, why use func (f HandlerFunc) instead of func (f *HandlerFunc)