Function db_upvalueid

third-party/lua-5.3.5/src/ldblib.c:284–288

static int db_upvalueid (lua_State *L) {
  int n = checkupval(L, 1, 2);
  lua_pushlightuserdata(L, lua_upvalueid(L, 1, n));
  return 1;
}


static int db_upvaluejoin (lua_State *L) {