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SV = PVIV(0x8150b10) at 0x814f6b4 <-- Can contain an IV and PV REFCNT = 1 ... PV = 0x81623f0 "123"\0 CUR = 3 LEN = 4
$ perl -MDevel::Peek -e'$x = 123; Dump $x; "$x"; Dump $x' SV = IV(0x816a41c) at 0x814f69c ... PV = 0x81651a0 "123"\0 CUR = 3 LEN = 4