Because why not… :-)

Now more seriously: This project is a low level lib that is used as a building block for quite a few higher level abstractions on top of it. As such, compatibility (even with significantly outdated versions) is a major concern to me.

Note that I'm not suggesting putting significant amount of work into this. The patch is already here and, personally, I see little harm in supporting this.

Also note that I'm not suggesting we need to keep support indefinitely. Should this ever turn out to be a burden in the future, e.g. because we actually require any new language features or some external lib, then I'm all for dropping support again. If you want to discuss this further, I would suggest directing this to reactphp/reactphp#374 instead 👍

Supersedes / closes #119