This is an excellent question and the answer is: no, there is not a clever
way (or a desire) to avoid this.
The internals of transducer functions are never lazy. Each "step" will be
eagerly completed for each output element. This is a fundamental difference
between the lazy sequence and transdu
While watching Rich's strangeloop talk, I noticed a slight oddity in the
definition of mapcat.
I brought this up briefly in the IRC channel yesterday and the general
consensus seemed to be that this is awkward, but not easily solvable:
The original lazy definition of (mapcat) uses (concat), and
