Titlecasing iota subscript

[karl williamson]

The comments in SpecialCasing.txt were changed in 5.2 to include 
Titlecasing U+0345, not just uppercasing, and that confuses me.  It says 
that it needs to be moved after all other marks on the preceding 
character.  That makes sense to me, because it stops being a mark at 
that point, and becomes a (separate) capital iota.

But I don't understand the titlecasing part.  Is it meant, when 
titlecasing the base character the iota subscript is combined with? 
That would also make sense, but then I would think it should move and 
become a small letter iota instead, U+03B9.

Or is it meant when the mark is in isolation, not combined with a base 
character.  This can happen only after a few characters in Unicode, such 
as a newline or zero width space.  And then I don't understand what 
would be done.  If ordered properly, in such a situation, any marks in 
this isolation situation would already be in front of the iota 
subscript, as they all have ccc less than it.  Would it then become a 
small letter iota?

Thanks