# with my Ubuntu system perl v5.26.1
% perl -MDevel::Peek -wle 'for(0x1p+60, 0x1p+60, 0x1p+60) { Dump($_); print $_ + 1; Dump($_) }'
SV = NV(0x558a66569f70) at 0x558a66569f88
  REFCNT = 2
  FLAGS = (NOK,READONLY,PROTECT,pNOK)
  NV = 1.15292150460685e+18
1.15292150460685e+18
SV = PVNV(0x558a665410f0) at 0x558a66569f88
  REFCNT = 2
  FLAGS = (NOK,READONLY,PROTECT,pIOK,pNOK)
  IV = 1152921504606846976
  NV = 1.15292150460685e+18
  PV = 0
SV = NV(0x558a66569f88) at 0x558a66569fa0
  REFCNT = 2
  FLAGS = (NOK,READONLY,PROTECT,pNOK)
  NV = 1.15292150460685e+18
1152921504606846977
SV = NV(0x558a66569f88) at 0x558a66569fa0
  REFCNT = 2
  FLAGS = (NOK,READONLY,PROTECT,pNOK)
  NV = 1.15292150460685e+18
SV = NV(0x558a6656a018) at 0x558a6656a030
  REFCNT = 2
  FLAGS = (NOK,READONLY,PROTECT,pNOK)
  NV = 1.15292150460685e+18
1152921504606846977
SV = NV(0x558a6656a018) at 0x558a6656a030
  REFCNT = 2
  FLAGS = (NOK,READONLY,PROTECT,pNOK)
  NV = 1.15292150460685e+18