[XeTeX] Changing bold-style by \unimathsetup doesn't work

[Tobias Schoel]

Hi,

Setting bold-style=TeX (or any other possible value) as 
\setmathfont-option works, but changing it later with \unimathsetup 
doesn't work. As there is no \addfontfeature-command, this seems to be a 
grave issue, as the options other than literal rigorously ignore literal 
input.

This is a bug report also filed in github, but I can't attach files 
there. The files attached with this mail show the rigorous behaviour of 
bold-style.

bye Toscho

PS: It seems wrong to me, to ignore the meaning associated with the 
explicit use of unicode math alphabets. When I input "Mathematical Bold 
Italic Capital T" / \mbfitT I want that, but when I input "Mathematical 
Bold Capital T" / \mbfT I don't want it italic.
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