[XeTeX] Math class initialization in Unicde-aware engine

[Joseph Wright]

On 02/12/2019 17:52, Doug McKenna wrote:
> Joseph -
> 
> A similar ambiguity occurs later in the README.md file.  It says
> 
> - \Umathcode for all letters as TeX class 7 (var)
> 
> Does "letters" mean those code points on the TeX side with \catcode 11, or those Unicode code points labeled with 'L' in UnicodeData.txt?
> 
> If the former, then combining marks (Unicode 'M') should be entered into \Umathcode as TeX class 7; if the latter, then presumably not, though it's not clear why a math variable name can't have a combining mark.
> 
> - Doug McKenna
> 

The former: I've clarified.

Joseph