I promoted many standard libraries to the default gems. You can see them at https://stdgems.org/#default-gems-ruby-301 I propose the following libraries to promote the bundled gems from the default gems. ``` ostruct: matrix net/smtp net/ftp net/pop net/imap ``` They have primary maintainer in the canonical repository in github. So, they can release the new version with their convenience. @shugo @marcandre Any thought? And I also propose to extract the following libraries from the default gems. ``` mutex_m tracer fcntl syslog prime ``` They are no longer actively maintained and not widely used today.