I dunno what to say about this. I can't replicate these build failures locally, and they also appear to be in actix-cors which I didn't change.

I tested a variety of ways that edition 2021/2018 and rust 1.54/1.60 may have interacted to cause a dependency issues, and I can't find anything.

The download of hashbrown failure may be an availability issue? Perhaps the solution is to re-run pipeline? I don't see that I can trigger it again...

Nah, hashbrown started to use edition 2021 and it means we have to bump up our MSRV to 1.56. I'll handle it later so you don't have to worry about it.

#233 is a big change and will likely conflict with this MR but I'd like to get it merged first (very soon).

I can believe that a function like this is still useful after the overhaul but I'd like to see a test added demonstrating one or two use cases.