EXTEND_MORTAL(nkeys);
        EXTEND(SP, ext);

        while ((entry = hv_iternext(hv))) {
            if (flags & 1) {
                SV *keysv = newSVhek(HeKEY_hek(entry));
                SvTEMP_on(keysv);
                PL_tmps_stack[++PL_tmps_ix] = keysv;
                PUSHs(keysv);
            }
            if (flags & 2)
                PUSHs(HeVAL(entry));
        }