+foreach my $h (qw(From To Cc)) {
+ my $n = '"Quoted N\'Ame" <foo@EXAMPLE.com>';
+ $mime->header_str_set($h, "$n");
+ my $q = content_id($mime);
+ is($n, $mime->header($h), "content_id does not mutate $h:");
+ $mime->header_str_set($h, 'Quoted N\'Ame <foo@example.com>');
+ my $nq = content_id($mime);
+ is($nq, $q, "quotes ignored in $h:");
+}
+