Is this content stream reachable with the API?

[RamKromberg]

How do I reach the content stream with "/Im0 Do" (0 4 obj) in this example?

I tried:

package main

import (
	"fmt"

	"github.com/ledongthuc/pdf"
)

func main() {
	pdf.DebugOn = true

	f, r, err := pdf.Open("test.pdf")
	defer f.Close()
	if err != nil {
		panic(err)
	}

	page := r.Page(1)
	//fmt.Println(r)
	fmt.Println(page)
	fmt.Println(page.Content())
	return
}

Which outputs this:

{<</Contents 4 0 R /MediaBox [0 0 198.75 235.5] /Parent 1 0 R /Resources <</XObject <</Im0 5 0 R>>>> /Type /Page /pdftk_PageNum 1>>}
{[] []}

So it doesn't seem to work even though the code has token handling for everything you'd expect from a graphic stack content stream.

So, is it a bug or am I missing something obvious?

Thanks.

p.s. the sample came out of img2pdf and was uncompressed with pdftk to make it more convenient to open with a text editor and debug.