zsh_completion: Fix single letter args Things like -n to specify the lines to show with systemctl and journalctl accepts syntax like: journalctl -n4 systemctl -n14 Previously, typing `-nXX <tab>` where XX is a number, zsh would try to complete an integer. Now it will see the XX and use the _journalctl_none completion. This is also how any of the single letter options that take arguments work as well.

zsh_completion: Allow specifying multiple arguments Some of the options in systemd can take multiple arguments, such as systemctl's --type option. Previously, you would only be able to complete a single type after the -t, but now zsh will continue to complete the types, separating them by commas. systemd-inhibit's --what command has colon (:), and that has been taken into account.