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SV = PVMG(0x2e04558) at 0x3dce60
  REFCNT = 1
...
      RV = 0x26ad20
      SV = PVHV(0x25c8e0) at 0x26ad20
        ...

SV = PVMG(0x2e04558) at 0x3dce60
  REFCNT = 2
...
      RV = 0x26ad20
      SV = PVHV(0x25c8e0) at 0x26ad20
        ...

    SvMAGICAL_off(sv);
    SvREADONLY_off(sv);
...
        /* 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;
    }