libinput11 will be the newset library and the Xorg connections will also be updated.
Xorg -
QuoteThe X.Org libinput driver is a thin wrapper around libinput and allows for libinput to be used for input devices in X. This driver can be used as as drop-in replacement for evdev and synaptics.
https://www.freedesktop.org/wiki/Software/libinput/
Basic Front Page
https://lists.freedesktop.org/archives/wayland-devel/2018-June/038349.html
Announcement for 11
And a webpage of pages of info about libinput Related Pages
https://wayland.freedesktop.org/libinput/doc/latest/pages.html
Tap to click behaviour
https://wayland.freedesktop.org/libinput/doc/latest/tapping.html#tapping_default
This has not arrived yet to unstable and so is not in Sparky 5 In my Debian stable box (equivalent to Sparky4) and my Sparky5 libinput10 is in place.