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    $diff ||= "Strings contain the same sequence of characters"
    	if length($a);
    $diff .= "\n" if $diff;
    return "a: $a_desc\nb: $b_desc\n$diff";
}
    

sub data_string_diff {
    # Compares 'logical' characters, not bytes, so a latin1 string and an
    # an equivalent unicode string will compare as equal even though their
    # byte encodings are different.
    my ($a, $b) = @_;
    unless (defined $a and defined $b) {             # one undef
	return ""
		if !defined $a and !defined $b;
	return "String a is undef, string b has ".length($b)." characters"
		if !defined $a;
	return "String b is undef, string a has ".length($a)." characters"
		if !defined $b;
    }