Ping?

not forgotten. Just been really busy at work, and because I don't understand lua as well as you, I need to run this through my own tests and try this out before I'm happy with it.

Have similar issues. @karlp can you merge this PR. Really appreciate it!

Please could this be merged. Will allow this library to be used in concurrent programs making use of co-routines

Any updates on this PR?

For my sake at least, I simply felt uncomfortable with how much this PR had to change. I needed to do a lot more testing on it to understand it, and it has simply never been a priority for me. I've still got this ticket as an "unread email" because it really does appear to be a real issue, but I'm personally unlikely to ever find the time to wrap my head around it. (I'm not a co-routine user, really at all) One of the other maintainers may have more time allocated for this. My complete lack of co-routine usage just make this a hard project.

I second @karlp. I also don't have the time to really get to the bottom of this. My major concern is that these proposed changes would cause a regression in existing functionality, which seems warranted with commit statements like:
This commit changes errors from undefined behaviour (that luckily used to get reported) to silently discarding errors.
Having a solid set of unit tests with good code coverage would help. Any takers?