Hi, for anybody interested: I made a patch for Lua 4.0 that implements a boolean type (or better a 'false' type *g*). More about it at the bottom of this page: http://lua-users.org/wiki/BooleanTypeProposal and the patch itself is here: http://lua-users.org/files/wiki_insecure/users/froese/bool-patch-1 Ciao, ET.