OK, thanks for confirming that!

Today's mystery guest is...

The moi.selection property, which references a Selection object with the single property 'filter', which is a string (which always seems to be empty). I've tried fiddling around with this one interactively a bit, but have never been able to figure out what it is used for or how it works.

I picked this one because documenting it will close out both the moi object and the Selection class at the same time :-)