Should this also work for interfaces? E.g. declare @immutable on the interface means all implementations are immutable

Should this also work for interfaces? E.g. declare @immutable on the interface means all implementations are immutable

I might be missing something, but I think it should be fine because immutable currently only makes all props readonly and interfaces don't have props, right?
Methods are by default considered to be pure AFAIK and therefore they are not considered via immutable yet.

Thank you!