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$ perl -MDevel::Peek -le 'Dump(17 + (2 ** 56))' SV = NV(0x10450940) at 0x10410fd0 REFCNT = 1 FLAGS = (PADBUSY,PADTMP,NOK,READONLY,pNOK) NV = 7.2057594037928e+16
$ perl -Minteger -MDevel::Peek -le 'Dump(17 + (2 ** 56))' SV = IV(0x10429358) at 0x10410fdc REFCNT = 1 FLAGS = (PADBUSY,PADTMP,IOK,READONLY,pIOK) IV = 72057594037927953