class type : sometimes it doesn't unfold

[pw374]

In http://ocaml.org.philippewang.info/pkg/docs/?package=camomile&module=CamomileLibrary when I unfold module OOChannel and then try to unfold class type ['a] obj_input_channel, it doesn't work.

However http://ocaml.org.philippewang.info/pkg/docs/?package=camomile&module=CamomileLibrary.OOChannel&class=obj_input_channel does work. And unfolding the same class type but on this page instead http://ocaml.org.philippewang.info/pkg/docs/?package=camomile&module=CamomileLibrary.OOChannel does work!