we're ready to bless ASDF 3.1.4.25 as release 3.1.5, and now is a good time to test it before it's too late. Anton, do you have time and/or resource for a run of cl-test-grid?
FWIW, the hu.dwim universe builds without any issues.
We did add better immutable-system support thanks to Dave Cooper,
is this meant to be the final public API (an exported global variable that holds a hashtable)?
maybe a simple defun SYSTEM-MUTABLE-P and a setf variant would be better?