335   int isnum;  in luaL_checknumber()  local
336   lua_Number d = lua_tonumberx(L, narg, &isnum);  in luaL_checknumber()
337   if (!isnum)  in luaL_checknumber()
349   int isnum;  in luaL_checkinteger()  local
350   lua_Integer d = lua_tointegerx(L, narg, &isnum);  in luaL_checkinteger()
351   if (!isnum)  in luaL_checkinteger()
358   int isnum;  in luaL_checkunsigned()  local
359   lua_Unsigned d = lua_tounsignedx(L, narg, &isnum);  in luaL_checkunsigned()
360   if (!isnum)  in luaL_checkunsigned()
582   int isnum;  in luaL_len()  local
584   l = (int)lua_tointegerx(L, -1, &isnum);  in luaL_len()
585   if (!isnum)  in luaL_len()