buhhh

It seems like the use of `with-redefs` in `kaocha.plugin.capture-output/with-capture` does not fit tests running in parallel. Could you provide some reasoning for the current implementation? Seems like it would target...

> This plugin doesn't really work well with parallelization because it was written before we introduced this feature and hasn't been updated yet. I don't think the design of kaocha.plugin.capture-output...

So what is the reasoning for the current implementation, (i) the use of `with-redefs` and the (ii) `active-buffers` construct?

@nwjsmith Thanks for the hint. Now as far as I have understood Eftest is multi-threaded by default suggesting the implementation is in fact intended for this situation. I have found...