->{'tiedScalar'} outside of FETCH: 

SV = PVMG(0x2e04558) at 0x3dce60
  REFCNT = 1
  FLAGS = (GMG,SMG,RMG)
  IV = 0
  NV = 0
  PV = 0
  MAGIC = 0x2e4ac58
    MG_VIRTUAL = &PL_vtbl_packelem
    MG_TYPE = PERL_MAGIC_tiedscalar(q)
    MG_FLAGS = 0x02
      REFCOUNTED
    MG_OBJ = 0x26ad98
    SV = IV(0x26ad90) at 0x26ad98
      REFCNT = 1
      FLAGS = (ROK)
      RV = 0x26ad20
      SV = PVHV(0x25c8e0) at 0x26ad20
        ...

[download]

->{'tiedScalar'} inside of FETCH: 

SV = PVMG(0x2e04558) at 0x3dce60
  REFCNT = 2
  FLAGS = ()
  IV = 0
  NV = 0
  PV = 0
  MAGIC = 0x2e4ac58
    MG_VIRTUAL = &PL_vtbl_packelem
    MG_TYPE = PERL_MAGIC_tiedscalar(q)
    MG_FLAGS = 0x02
      REFCOUNTED
    MG_OBJ = 0x26ad98
    SV = IV(0x26ad90) at 0x26ad98
      REFCNT = 1
      FLAGS = (ROK)
      RV = 0x26ad20
      SV = PVHV(0x25c8e0) at 0x26ad20
        ...

[download]

What happened to the flags? Some protection against infinite loops?

Update: This is done by save_magic and restore_magic in mg.c. Definitely intentional. Key aspects: 

    SvMAGICAL_off(sv);
    SvREADONLY_off(sv);
    if (!(SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK))) {
        /* No public flags are set, so promote any private flags to pu
+blic.  */
        SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PR
+IVSHIFT;
    }

[download]

In reply to Re: untie() and tied() and UNTIE dont work right inside FETCH with tied scalar by ikegami
in thread untie() and tied() and UNTIE dont work right inside FETCH with tied scalar by patcat88

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