> There are two hyphen.cfg files in TL2010, one for babel and one for luatex.
Indeed, and the second one has been designed so as *not* to load
hyphenation patterns when generating formats, because it is possible in
LuaTeX to load patterns on the fly, unlike in any other TeX engine.
This means that the patterns are not dumped into the format, and
brings significant speed-up both when generating formats and (above all)
when loading it, which is of benefit to Lua(La)TeX users, who can then
load patterns on demand when switching languages. This is not possible in
XeTeX, the behaviour of which is much closer to that of pdfTeX in that
respect.
Arthur
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