Function luaL_checknumber

extlibs/lua/src/lauxlib.c:420–426

LUALIB_API lua_Number luaL_checknumber (lua_State *L, int arg) {
  int isnum;
  lua_Number d = lua_tonumberx(L, arg, &isnum);
  if (!isnum)
    tag_error(L, arg, LUA_TNUMBER);
  return d;
}


LUALIB_API lua_Number luaL_optnumber (lua_State *L, int arg, lua_Number def) {