Actually, I have a way this would work well. If you’re interpolating a value that comes from configuration and wouldn’t change. Example: /admin@#{Rails.config

Actually, I have a way this would work well. If you’re interpolating a value that comes from configuration and wouldn’t change. Example: /admin@#{Rails.config.x.domain}/io But you’re right that a constant would be a lot more clear. “o” is a footgun.