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I can't believe the following is the best way of not happily
accepting pi=3 etc. Too many calls to genuine functions as
distinct from macros.

#define reallycheckint(L,index) (\
  luaL_argcheck(L,lua_compare(L,index,-1,LUA_OPEQ),index,"expected integer"),\
  lua_pop(L,1), lua_tointeger(L,index) )

But every time I try to improve on it I need to store something
in a C variable.