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  1. or download this
    SV *tmp = newSVsv(foo);
do_something(tmp);
SvREFCNT_dec(tmp);
  2. or download this
    SV *tmp = sv_2mortal(newSVsv(foo));
do_something(tmp);
/* no clean up code required here */
  3. or download this
    SV *tmp = sv_2mortal(newSVsv(foo));
if (av_store(av, ix, tmp)) SvREFCNT_inc(tmp);