Attrtibute disappearing on update

[voodoos]

I think I it a bug, I made a reproduction in #62

The test should show a single opened <detail> element with some text:

let accordion ~name ~title content =
  (* TODO there might a bug in lwd: the open attribute disapears when updated
      This does not happen if we use an Elwd.details *)
  let at =[
    At.name (Jstr.v name);
    At.v (Jstr.v "open") (Jstr.v "true") ]
  in
  El.details ~at
    ((El.summary [ title ]) :: [ (El.section content) ])

let score = Lwd.var "Notes"

let ui =
  let e = Lwd.map (Lwd.get score) ~f:(fun score ->
    accordion ~name:"test-acc" ~title:(El.txt' "Bandonéon" )
      [El.txt' score])
  in
  Elwd.div [ `R e]

But instead it is closed:

This only appears after the first update of the text: the element is rebuilt and loses it's open attribute.
In the test the entire details element is static, when the text changes a fresh detail is created.
(Using a Elwd.detail and inly update the text node does not trigger the issue.)

I plan to have a look when I find some time.