I recall from Rich's presentation on reducers (and it's intuitively true 
anyway) that FJ is not well suited to all workloads: uniform ones would do 
just fine with a fixed allocation of tasks to threads. I believe the 
tradeoff in that case is that one has to manage parallelism very explicitly.

Now, is it feasible to provide a reducers implementation backed by a fixed 
thead pool? How well would it perform (provided the workload is suitable)?

Similarly, I'd find tempting (just if a little crazy) to define clj's "seq 
library" (map, filter, reduce...) as a huge protocol, providing e.g. 
simple-lazy, chunked, FJ, and fixed-thread-pool implementations.

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