I forget to mention, this might make the proposed [Feature #13721]
("net/imap: dedupe attr keys in Net::IMAP::FetchData")
obsolete: https://bugs.ruby-lang.org/issues/13721

Along with the necessity to make similar changes down the line.

Unsubscribe: <mailto:ruby-core-request / ruby-lang.org?subject=unsubscribe>
<http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>