What's the point of order-only dependencies in `rake`?

[x-yuri]

The ones added by #269. If you're adding that, then you probably want file tasks to ignore order-only dependencies?

https://github.com/ruby/rake/blob/5c60da8644a9e4f655e819252e3b6ca77f42b7af/lib/rake/file_task.rb#L32-L41