SV

• Here's the basic SV structure

   struct STRUCT_SV {
     void* sv_any; /* pointer to something */
     U32 sv_refcnt; /* how many references to us */
     U32 sv_flags; /* what we are */
   };
  

• sv_any will point to the payload (number, string, both, ...)
  • sv_upgrade
  • no sv_downgrade