SvOK_off(sv);
SvIVX(sv) = 0;
SvOBJECT_off(sv);

##</code><code>##

SV *sv = SvRV(obj);
if (sv) {
    /* detach from the C struct and invalidate */
    mg_free(sv); /* remove any magic */
    SvFLAGS(sv) = 0;  /* invalidate the sv */
}

##</code><code>##

/* Clear the sv field so that there will be no dangling ptrs */
if (it->sv) {
    // SvOBJECT_off((SV *)it->sv);  /* problematic, issue #385 */
    mg_free(it->sv);  /* remove any magic instead */
    sv_setiv(it->sv,0x4242);
    it->sv = NULL;
}