SV* newRV_inc((SV*) thing);
SV* newRV_noinc((SV*) thing);
U32 SvROK(SV*) Has a valid reference pointer?
SV* SvRV(SV*)
void SvROK_on(SV*) Tells an SV that it is an RV.
void SvROK_off(SV*) Unsets the RV status of an SV.
int SvREFCNT(SV* sv);
SV* SvREFCNT_inc(SV* sv);
void SvREFCNT_dec(SV* sv);
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