Conditional roundness

[DennisDv24]

I'm submitting a…

[ ] Bug
[x] Feature Request
[ ] Documentation Request
[ ] Other (Please describe in detail)

Current Behavior

Im trying

for_window [class = "discord"] border_radius 20

But nothing happens. Is this a bug, is not implemented or I'm stupid?

Environment

Output of i3 --moreversion 2>&-:

i3 version: 4.16.1-186-gf3fffbae

Manjaro x86_64
compton-tryone