count := 0
	return func(w http.ResponseWriter, r *http.Request) {
		count = count + 1
		r.Header.Set("MY-COUNT", fmt.Sprint(count))
		wrappedHandler(w, r)
	}
}

func twoMiddleware(wrappedHandler http.Handler) http.HandlerFunc {
	count := 0
	return func(w http.ResponseWriter, r *http.Request) {
		count = count + 1
		r.Header.Set("MY-COUNT", fmt.Sprint(count))
		wrappedHandler.ServeHTTP(w, r)
	}
}

func threeMiddleware(wrappedHandler http.Handler) http.Handler {
	count := 0
	return http.HandlerFunc(
		func(w http.ResponseWriter, r *http.Request) {
			count = count + 1
			r.Header.Set("MY-COUNT", fmt.Sprint(count))
			wrappedHandler.ServeHTTP(w, r)
		},
	)
}

func BenchmarkMid(b *testing.B) {
	b.Run("oneMiddleware", func(b *testing.B) {
		h := oneMiddleware(func(w http.ResponseWriter, r *http.Request) {
			fmt.Fprint(w, "ok")
		})
		rec := httptest.NewRecorder()
		req := httptest.NewRequest(http.MethodGet, "/someUri", nil)

		b.ReportAllocs()
		b.ResetTimer()
		for n := 0; n < b.N; n++ {
			h.ServeHTTP(rec, req)
		}
	})

	b.Run("twoMiddleware", func(b *testing.B) {
		h := twoMiddleware(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			fmt.Fprint(w, "ok")
		}))
		rec := httptest.NewRecorder()
		req := httptest.NewRequest(http.MethodGet, "/someUri", nil)

		b.ReportAllocs()
		b.ResetTimer()
		for n := 0; n < b.N; n++ {
			h.ServeHTTP(rec, req)
		}
	})

	b.Run("threeMiddleware", func(b *testing.B) {
		h := threeMiddleware(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			fmt.Fprint(w, "ok")
		}))
		rec := httptest.NewRecorder()
		req := httptest.NewRequest(http.MethodGet, "/someUri", nil)

		b.ReportAllocs()
		b.ResetTimer()
		for n := 0; n < b.N; n++ {
			h.ServeHTTP(rec, req)
		}
	})
}

go test -benchmem -run=^$ -bench ^BenchmarkMid$ github.com/komuw/ong/mux -count=5
BenchmarkMid/oneMiddleware-8      358.7 ns/op
BenchmarkMid/oneMiddleware-8      371.8 ns/op
BenchmarkMid/oneMiddleware-8      343.6 ns/op
BenchmarkMid/oneMiddleware-8      289.0 ns/op
BenchmarkMid/oneMiddleware-8      291.4 ns/op

BenchmarkMid/twoMiddleware-8      296.7 ns/op
BenchmarkMid/twoMiddleware-8      353.3 ns/op
BenchmarkMid/twoMiddleware-8      363.2 ns/op
BenchmarkMid/twoMiddleware-8      366.2 ns/op
BenchmarkMid/twoMiddleware-8      315.2 ns/op

BenchmarkMid/threeMiddleware-8    299.0 ns/op
BenchmarkMid/threeMiddleware-8    307.6 ns/op
BenchmarkMid/threeMiddleware-8    324.9 ns/op
BenchmarkMid/threeMiddleware-8    367.6 ns/op
BenchmarkMid/threeMiddleware-8    373.3 ns/op

The change we want is `threeMiddleware` and it seems competitive with the others.