The includes for diskfont.library suggest to check OT_UnicodeRanges for UCR_SURROGATES if you want to use any characters above 0xFFFF. The problem with this is that none of my .otag files have OT_UnicodeRanges in them. I don't think TypeManager is creating this when new fonts are installed, making the tag entirely useless.
Can this be added? Or rather (as I assume it is supposed to be including this information), fixed?