[XeTeX] XeTeXcharclass inserts spaces

[Ulrike Fischer]

Hello,

In the following document I get spaces between the "a" and the "b", but
not between "d" and "b". Bug or feature?

This is XeTeX, Version 3.1415926-2.2-0.999.6 (miktex):

\documentclass{book}
\XeTeXinterchartokenstate=1

\begin{document}
\XeTeXcharclass `\b 2
\XeTeXcharclass `\d 3 

aba

dbd
\end{document}


-- 
Ulrike Fischer