my @a;
for (0..10) {
    my $ref = [$_];
    push @a, $ref;
}
for (sort { $a cmp $b } @a) {
    say "ref: $_ item: $_->[0]"
}

ref: ARRAY(0x833da18) item: 0
ref: ARRAY(0x8358198) item: 1
ref: ARRAY(0x83581b8) item: 6
ref: ARRAY(0x8358208) item: 4
ref: ARRAY(0x8358258) item: 5
ref: ARRAY(0x83582e8) item: 3
ref: ARRAY(0x8358338) item: 2
ref: ARRAY(0x83584a8) item: 8
ref: ARRAY(0x83584d8) item: 7
ref: ARRAY(0x8364ea0) item: 9
ref: ARRAY(0x8364ed0) item: 10