If case really doesn't matter, then the best solution is to just initialize the values with lc.

However, you can also set the values to lc after the fact as well:

lcvalues(@array1);
lcvalues(@array2);

sub lcvalues {
    for (@_) {
        if (ref $_ eq 'HASH') {
            lcvalues(values %$_);
        } elsif (ref $_ eq 'ARRAY') {
            lcvalues(@$_);
        } elsif (ref $_) {
            warn "Unknown data type: " . ref $_;
        } else {
            $_ = lc $_;
        }
    }
}
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