Not yet. Working with each open-source demanded a lot of effort, so we were hoping that integrating it into a few dominant libraries will attract the attention of the rest. We will happily assist them if they need/want our help.
The musl mailing list is very active, and communication with the maintainers is generally effortless. It would be interesting to see how this plays out. They are also in the process of rewriting their malloc implementation.
