"Private" module?

Developers Ruby API
1

Does anyone else have a Private module defined under Sketchup? Any idea where it came from? Searching my installed extensions turned up nothing.

Sketchup::Private.class # ==> Module
Sketchup::Private::Forwardable.class # ==> Module
2

I see it as well, seems to be a builtin…
I see it when Sketchup.plugins_disabled=true
john