$ perl -MDevel::Peek -E'$_ = 2**31; ++$_; say "value: $_"; Dump $_;' value: 2147483649 SV = PVNV(0x8cc0ac8) at 0x8cebef8 REFCNT = 1 FLAGS = (IOK,POK,pIOK,pPOK,IsUV) UV = 2147483649 NV = 2147483648 PV = 0x8cdf378 "2147483649"\0 CUR = 10 LEN = 12