How to task pool in vibe.d?

[Computermatronic via Digitalmars-d-learn]

I'd like to create a bunch of tasks in vibe.d, then wait for them 
all to complete.

Using std.concurrency and std.parallelism this is trivial.
I could just spawn a bunch of vibe.d tasks and then iteratively 
join them, but I would think vibe.d would provide some primitives 
for task-pooling.