Re: LATIN SMALL LIGATURE CT

[Eric Muller]

Peter Constable wrote:

Adobe included this and other ligatures in their use of the PUA for
their own legacy reasons;
More specifically, to allow applications which do not have OpenType 
layout to display those ligatures.

it has otherwise never been necessary for them
to do so in their Pro fonts, 

Indeed, InDesign does not use those code points.

and I believe they are moving away from
that practice.
Not until the majority of applications support OpenType layout, and, 
more importantly, the majority of documents have been migrated to not 
use those PUA characters. In other words, probably never for existing 
fonts.

Eric.