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I am just looking for some clarification when using the macro
LUA_USE_APICHECK, is it the case that indicators in the manual are not
respected for functions when using this macro? I ask because I decided
to turn the option on and run unit tests on OOLua to find that an
assert is being triggered for the function lua_touserdata (indirectly
via index2addr) with it, yet the manual states "'-' means the function
never throws any error". The situation under test was trying to pull a
user data of an empty stack which as I understood it would return NULL
and does without the macro, this situation is handled gracefully in
the test but means I can not use the macro as is. Firstly because an
assert (from assert.h) in unit tests is bad and also it would require
different tests for release and debug builds.