Ah, no, nevermind, bad idea. Then the `Pipeline` doesn't inherit any overridden behavior of the `StatsClient` it came from. (E.g.: as is, if you extend `StatsClient` and override `_send`, the `Pipeline` uses the subclass' `_send`. If I changed this, it wouldn't, and you'd need to extend both `StatsClient` and `Pipeline` and override `StatsClient.pipeline`, too.)