Using IO.realTime in `ReceiveTimeout`, etc?

[dragospe]

There are a handful of places where System.currentTimeMillis is used instead of something like Temporal[F].realTime.

This makes it difficult to work with under TestControl sometimes.

I'll likely try to do a simple replacement on my own for testing, but I wanted to ask -- is there a specific reason why Temporal wasn't used? Has anyone tried to make this change and found reasons not to?

Thanks!