About extra parameter in Kitty Keyboard Protocol output on macOS

[ssl19]

When using on kitty on macOS 15.6.1 I just noticed that some of the ctrl-alt combination emit an extra key on
kitten show-key -m kitty
For example Ctrl+Alt+Space:
which I think should be: CSI 32;7u
but instead, it prints: CSI 32;7;32u

The effect key I can verify is :

` 1 2 3 4 5 6 7 8 9 0 = ; ' , . /

and space

And it seems work as expected on linux.

Can others confirm this behavior on macOS? I can raise a issue if it is reproducible.

[kovidgoyal]

That's not an extra key, thats the field representing the text that the key event generates. Try typing ctrl+alt+1 in Terminal.app you will see that it inserts the text 1. This is a macOS specific behavior.