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  1. or download this
    SvOK_off(sv);
SvIVX(sv) = 0;
SvOBJECT_off(sv);
  2. or download this
    SV *sv = SvRV(obj);
if (sv) {
...
    mg_free(sv); /* remove any magic */
    SvFLAGS(sv) = 0;  /* invalidate the sv */
}
  3. or download this
    /* Clear the sv field so that there will be no dangling ptrs */
if (it->sv) {
...
    sv_setiv(it->sv,0x4242);
    it->sv = NULL;
}