CACHE_MISS is unavailable in cml files
I tried to use mod_cml, but failed when I used CACHE_MISS and CACHE_HIT. I succeeded when I use 0 or 1 for return values.
The reason is that CACHE_* are boolean values but the return value is assumed as a number. In my environment (lua 5.0.2), lua_tonumber checks the type of specified variable, and returns 0 (==CACHE_HIT) if the specified valiable does not keep number. Therefore, cache-miss never occurs if CACHE_* are used.
IMO, lua_pushnumber should be used for CACHE_*, instead of lua_pushboolean.
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