I'm not entirely happy with passing it along here and then a few lines later joining the array with newlines into `res.body`.

On the one hand, it's not impossible to detect if there is additional middleware, and even the identity of them, so I could optionally not join the array into `res.body`, relying on the subsequent middleware to do so. However, this is brittle, since we can't rely on everyone utilizing the new `combohandler#respond` endpoint middleware (which I would add an awareness of "is res.body an array?", etc).

So, anyway, I'm open to imrovements in this area.