ohhh, because of hilaaaaarious reasons.

I did it that way first, of course. And then I got bizarre test failures in untouched part of the codebase. After a good while investigating, I realized it's because those tests are patching the treq module, but doing it by assigning to otter.util.http.treq! So, specifying "treq" as the default value here would create an early binding to the *real* treq module, making the patch ineffective.

This is *exactly* the kind of problem I am trying to exterminate with this patch, by the way ;-)