[XeTeX] not enough \XeTeXcharclass registers

[Philip Taylor]

Zdenek Wagner wrote:

> \maxdimen is a maximum dimension value, not a maximum number of \dimen
> registers.

Yes, I agree Zdeněk (I remembered that, even if I did not remember that
it is defined in Plain.TeX rather than a primitive !); I should have
suggested that the new environmental enquiry be called
\maxintercharclass, I suppose, to make its meaning more transparent.

Just as \maxdimen indicates that a <dimen> value may not exceed
\maxdimen, so \maxintercharclass would indicate that a <interchar class>
value may not exceed \maxintercharclass.

** Phil.