[Roboprog]

I played with the idea of something like this a while back, but never finished it:

https://github.com/roboprog/buzzard/blob/master/test/src/mai...

It performed reasonably well in a demo doing a bunch of string concatenation, but I never followed up on it.

https://github.com/roboprog/mp_bench/blob/master/thd_frk.bzr...