Keyboard backlight settings inconsistently jump in steps of 9 or 10

[sockbot]

System details

MacBook Air 2014

What's wrong?

Issue

When increasing keyboard backlight brightness, the levels are set to:

0, 9, 19, 29, 39, 49, 58, 68, 78, 88, 98, 100

When decreasing brightness, the levels are set to:

100, 90, 80, 70, 60, 50, 41, 31, 21, 11, 1, 0

This means in order to set my brightness to 1%, I must first set the brightness to 100, then lower it to 1 without accidentally setting to 0.

Expected behaviour

Keyboard brightness should be set to fixed values that are consistent going up and down. Those fixed values should include 0 (off), 1 (minimal brightness) and 100 (maximum brightness).

Instructions to reproduce

git checkout v3.6.0
Raise and lower keyboard backlight brightness using dedicated keys.

┌──────────────────────Hardware──────────────────────┐
 PC: MacBook Air (11-inch, Mid 2013/Early 2014) (1.0)
│ ├: Intel(R) Core(TM) i5-4260U (4) @ 2.70 GHz
│ ├: Intel Haswell-ULT Integrated Graphics Controller @ 1.00 GHz [Integrated]
│ ├󱄄: 1366x768 in 12", 60 Hz [Built-in]
│ ├󰋊: 82.81 GiB / 231.74 GiB (36%) - btrfs
│ ├: 2.01 GiB / 3.76 GiB (54%)
└ └󰓡 : 424.08 MiB / 1.88 GiB (22%)
└────────────────────────────────────────────────────┘

┌──────────────────────Software──────────────────────┐
 OS: Omarchy 3.6.0
│ ├󰘬: HEAD
│ ├󰔫: stable
│ ├: Linux 6.19.12-arch1-1
│ ├: Hyprland 0.54.3 (Wayland)
│ ├: ghostty 1.3.1-arch2
│ ├󰏖: 1188 (pacman)
│ ├󰸌: Kanagawa ●●●●●●●●
└ └: JetBrainsMono Nerd Font (9pt)
└────────────────────────────────────────────────────┘```