I took the same approach, with the same assumption, and then realized that "ordered rank" was the objective.
# Tested code; outputs:
# B E A C D
my @original = (5, 100, 2, 8, 40);
my $s = 'A';
my $n = 1;
my @sorted = map { $_->[2] }
sort { $a->[1] <=> $b->[1] }
map { [ @$_, $s++ ] }
sort { $a->[0] <=> $b->[0] }
map { [ $_, $n++ ] }
@original;
print "@sorted\n";
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