TODO


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- Upstream recommends spawn_async() instead of spawn_sync(), but the bindings
  for it are erroneous.

  See: https://gitlab.gnome.org/GNOME/vala/issues/721
       https://gitlab.gnome.org/GNOME/gobject-introspection/merge_requests/168
       https://gitlab.gnome.org/GNOME/vte/issues/227