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perl -MDevel::Peek -le "$b=[1,2,3]; $#a=$b;Dump $b;Dump $#a"

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SV = RV(0x1a5596c) at 0x1a44f68
  REFCNT = 1
...
    MG_VIRTUAL = &PL_vtbl_arylen
    MG_TYPE = PERL_MAGIC_arylen(#)
    MG_OBJ = 0x15d51a0