Most likely a List::Util issue. When you replace the min definition with
sub min { my ($a, $b) = @_; $a < $b ? $a : $b }
it works correctly.
Check the tracker if it's reported. I think it could be rt://107970. Perl $#arr is done with magic:
$ perl -MDevel::Peek -e 'my @a = (); Dump $#a;'
SV = PVMG(0x1034280) at 0xfe1cb8
REFCNT = 1
FLAGS = (GMG,SMG)
IV = 0
NV = 0
PV = 0
MAGIC = 0x1003260
MG_VIRTUAL = &PL_vtbl_arylen
MG_TYPE = PERL_MAGIC_arylen(#)
MG_OBJ = 0x1000658
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