Other distros have gpart 0.2.x by now, using https://github.com/baruch/gpart for a new upstream. For proof: Arch https://www.archlinux.org/packages/extra/x86_64/gpart/ Debian https://packages.debian.org/stretch/gpart It has potential to fix the open bugs on sys-block/gpart that we have.
There is gpart 0.3 in Gentoo as of today, closing as fixed.