Manipulating generalized token lists
The package provides tools for simple operations on lists of tokens which are not necessarily balanced. It is in particular used a lot in the unravel package, to go through tokens one at a time rather than having to work with entire braced groups at a time. The package requires an up-to-date l3kernel bundle.
You can contact the maintainers of this package via email at
texlive dash maintainers at fedoraproject dot org.