Minor issue: cfg files like graphics.cfg start out with
% Select an appropriate default driver \begingroup \chardef\x=0 % ...
which relies on spaces being "normal". While trying to get some l3 packages to work nicely together this failed for me because there spaces are ignored. Perhaps one could use \relax to terminate the \chardef instead.
It could be argued that resetting of spaces should be handled by the l3 loading mechanism but at least this will work anyway.
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Morten Høgholm
