What's the point of the "terminated" property?

[superbull]

In the current code, it seems the terminated property of the class Harmony is useless.

Is there any use case for this?

[kocsismate]

Yes, you are right, there is no need for it anymore, so I've just removed it in my last commit (442edf4)! Originally, It helped to ensure that final middlewares are only run once (but I became unsure if it was really needed).