(?^:abcdefg) vs (?^:abcdefg) at t/03scalar.t line 133.
SV = PVMG(0x2bc57b70) at 0x2bb040b0
  REFCNT = 1
  FLAGS = (SMG,POK,pPOK,UTF8)
  IV = 0
  NV = 0
  PV = 0x2bc336f0 "a\r\n"\0 [UTF8 "a\r\n"]
  CUR = 3
  LEN = 16
  MAGIC = 0x2b53c330
    MG_VIRTUAL = &PL_vtbl_utf8
    MG_TYPE = PERL_MAGIC_utf8(w)
    MG_LEN = -1
    MG_PTR = 0x2b532010
       0: 2 -> 2
       1: 0 -> 0
SV = PVMG(0x2bc57c00) at 0x2bc24748
  REFCNT = 1
  FLAGS = (SMG,POK,pPOK,UTF8)
  IV = 0
  NV = 0
  PV = 0x2bb56f80 "a\r\n"\0 [UTF8 "a\r\n"]
  CUR = 3
  LEN = 16
  MAGIC = 0x2bb51f70
    MG_VIRTUAL = &PL_vtbl_utf8
    MG_TYPE = PERL_MAGIC_utf8(w)
    MG_LEN = -1
    MG_PTR = 0x2bb52370
       0: 2 -> 2
       1: 0 -> 0