Thanks for your answer!

Of course I'm looking at the features, just trying not to byte more than I can chew. As for the mentioned points:

• subtest support already there, although a bit clumsy.
• fork'ed subtest/contract planned in the near future.
• threads - I have no real experience with threads, so I'd rather focus on AnyEvent/Coro who are also no piece of cake to test against.

I wonder if I can roll out a Builder-based backend as well...