$ perl -MDevel::Peek -e'Dump +(99**99**99)'
SV = NV(0x8165bd0) at 0x8160954
  REFCNT = 1
  FLAGS = (PADBUSY,PADTMP,NOK,READONLY,pNOK)
  NV = inf

$ perl -MDevel::Peek -e'Dump -(99**99**99)'
SV = NV(0x8165be0) at 0x814cc9c
  REFCNT = 1
  FLAGS = (PADBUSY,PADTMP,NOK,READONLY,pNOK)
  NV = -inf