I have an issue with these 2 functions: They have a run-time
stopping condition.
This is bad on several counts:
1. Piss poor performance. Also, the "safe" default of "shortest"
doen't help.
2. Traits support. In particular, things like length, empty or
infinite. Mixing inifinite and non-inifinite ranges creates
something that may or may not be infinite...
These issues are *not* solvable "in-place". The only solution is
a new range, but that takes its argument statically. I think it
would have big net benefits. And it would break nothing, since we
could keep around zip/lockstep (but not recommend them).
I'd want to start working on this, but I wanted to touch on a few
things here first:
1. Name? I'd need a name for this. Any thoughts?
2. Default value? AFAIK, *all* the times I've seen Zip/Lockstep
in action, it was on ranges that had the same length, yet used
the default "shortest" option, which is bad. I think it would be
better to default on `requireSameLength`, and have
shortest/longuest as explicit requests.
Thoughts? Suggestions for names?
