I came across it while working on some code running in the Leo editor.  I had no idea it was not really public; I just assumed that someone knew something I didn't.  Then I discovered that it couldn't find some files I  thought it clearly should, and wrote the issue, thinking it might help someone else who didn't know the limitations.

But from what you say, I see it will be better to use another way, and to leave this bit alone.  Thank you.