I have reported this a few month ago but since it has not been fixed, I
thought that it may have been forgotten. Try running xelatex on this minimal
example:
\documentclass{article}
\usepackage{fontspec}
\defaultfontfeatures{Numbers=OldStyle,Mapping=tex-text}
\setmainfont{Junicode}
\begin{document}
\(\mathbf{0123xyzjh}\)
\end{document}
log complains that:
Unknown feature `' in font `JunicodeRegular'.
Unknown feature `' in font `JunicodeRegular'.
This is not a problem but when preview package is used:
\documentclass{article}
\usepackage[xetex,tightpage,active,textmath]{preview}
\usepackage{fontspec}
\defaultfontfeatures{Numbers=OldStyle,Mapping=tex-text}
\setmainfont{Junicode}
\begin{document}
\(\mathbf{0123xyzjh}\)
\end{document}
Then you get error:
! Package xkeyval Error: no key specified for value `'.
See the xkeyval package documentation for explanation.
Type H <return> for immediate help.
...
l.5 \setmainfont{Junicode}
?
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