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   if (AvMAX(thing) != -1) {
      /* an array with 10 slots has AvMax() set to 9 - te 2007-04-22 *
+/
      total_size += sizeof(SV *) * (AvMAX(thing) + 1);

#define AvMAX(av)    ((XPVAV*)  SvANY(av))->xav_max

#define AvARRAY(av)    ((av)->sv_u.svu_array)
#define AvALLOC(av)    (*((SV***)&((XPVAV*)  SvANY(av))->xav_alloc))
#define AvMAX(av)    ((XPVAV*)  SvANY(av))->xav_max
#define AvFILLp(av)    ((XPVAV*)  SvANY(av))->xav_fill
#define AvARYLEN(av)    (*Perl_av_arylen_p(aTHX_ MUTABLE_AV(av)))

#define AvFILL(av)    ((SvRMAGICAL((const SV *) (av))) \
             ? mg_size(MUTABLE_SV(av)) : AvFILLp(av))