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SV = PVGV(0x816c6e8) at 0x814f6d8
  GP = 0x816c720
...
  GP = 0x81709f8
    CV = 0x0             <-- &Child::f doesn't exist
    CVGEN = 0x0

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SV = PVGV(0x816f938) at 0x814f810
  GP = 0x81709f8
    CV = 0x814f714       <-- &Child::f aliased to &Base::f
    CVGEN = 0x4d         <-- ...for method dispatch only

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SV = PVGV(0x816c6e8) at 0x814f6d8    # Reference (at 0x814f6d8) to typ
+eglob (at 0x816c6e8)?
  GP = 0x816c720                     # Address of typeglob? Has AV, HV
+, CV.
...
    CV = 0x0                         # Child::f()'s pointer to CV, equ
+iv place to Base::f()
    CVGEN = 0x0                      # "generated CV"? do you mean "th
+is CVGEN 'slot' is used for nothing else than method dispatch"?

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gv.c
453:                GvCVGEN(topgv) = PL_sub_generation;

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gv.c
457-        else if (topgv && GvREFCNT(topgv) == 1) {
...

1433-       /* Adding a new name to a subroutine invalidates method ca
+che */
1434:       PL_sub_generation++;

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dump.c
1544:   Perl_dump_indent(aTHX_ level, file, "    CVGEN = 0x%"UVxf"\n",
+ (UV)GvCVGEN(sv));

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sv.c
3330-       GvCVGEN(dstr) = 0; /* Switch off cacheness. */