>perl -MDevel::Peek -e"$_='0'; Dump $_; int; Dump $_;"
SV = PV(0x236054) at 0x18447c4
  REFCNT = 1
  FLAGS = (POK,pPOK)
  PV = 0x1824064 "0"\0
  CUR = 1
  LEN = 4
SV = PVIV(0x238030) at 0x18447c4
  REFCNT = 1
  FLAGS = (IOK,POK,pIOK,pPOK)
  IV = 0
  PV = 0x1824064 "0"\0
  CUR = 1
  LEN = 4