Noticing that I've used EventEmitter to report the error while
reconfigurations are returned from an async function.
Oddly, for the first time in my life, I saw this and trusted that I must have given this a lot of thought, because it most certainly would have bothered me when it first occured to me. We wouldn't want to use both a push and pull interface, but we don't want there to be a configuration if there is an error.
Although, as I write this, the order of errors matters, so the return from reconfigure should be a status, and then either the error or the configuration. Perhaps that level of indirection bothered me.