(?^:abcdefg) vs (?^:abcdefg) at t/03scalar.t line 133.
SV = PVMG(0x2595cb60) at 0x258097a0
  REFCNT = 1
  FLAGS = (SMG,POK,pPOK,UTF8)
  IV = 0
  NV = 0
  PV = 0x259385c0 "a\r\n"\0 [UTF8 "a\r\n"]
  CUR = 3
  LEN = 16
  MAGIC = 0x25241dc0
    MG_VIRTUAL = &PL_vtbl_utf8
    MG_TYPE = PERL_MAGIC_utf8(w)
    MG_LEN = -1
    MG_PTR = 0x25239070
       0: 2 -> 2
       1: 0 -> 0
SV = PVMG(0x2595cbc0) at 0x25931878
  REFCNT = 1
  FLAGS = (SMG,POK,pPOK,UTF8)
  IV = 0
  NV = 0
  PV = 0x25720c10 "a\r\n"\0 [UTF8 "a\r\n"]
  CUR = 3
  LEN = 16
  MAGIC = 0x25845e90
    MG_VIRTUAL = &PL_vtbl_utf8
    MG_TYPE = PERL_MAGIC_utf8(w)
    MG_LEN = -1
    MG_PTR = 0x25256870
       0: 2 -> 2
       1: 0 -> 0