SvPVIV – string & integer 

svpviv.png
Picture Credit: Reini Urban - Perl Guts Illustrated 
$s = "42";

SV = PV(0x2440c20) at 0x2460aa8
  REFCNT = 1
  FLAGS = (POK,pPOK)
  PV = 0x2459cf0 "42"\0
  CUR = 2
  LEN = 16