Some less-frequenty characters don't get interpreted when entering the label

[postsolar]

On my keyboard < happens to be just right of Shift and just below A, but when I'm using it as a label character it doesn't get interpreted. The error I'm getting is:

Error: 1:1: 'evaluate-commands': 3:1: 'execute-keys': register '^' does not contain a selections desc

Interestingly though characters which aren't mapped to Kakoune commands work fine, so ⛅ can be used as a label, which is nice to have.

[hadronized]

Yes, I made it unicode-aware. I think the problem with < is that it breaks Kakoune commands. I need to check how to interpret that correctly. Thanks for reporting!