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  1. or download this
    SV_CHECK_THINKFIRST_COW_DROP(rv);
(void)SvAMAGIC_off(rv);
...
SvREFCNT_inc(sv);

SvSETMAGIC(rv);
  2. or download this
    sv_replace(rv, newRV_inc(sv))
SvSETMAGIC(rv);