- It's unclear to me what clear-system does or should do that differs
from clear-defined-system. I see that clear-system is documented in asdf.texinfo, but clear-defined-system isn't; furthermore, clear-defined-system doesn't appear anywhere in quicklisp, as I can tell grepping through ~/quicklisp/dists/quicklisp/software after I install all of quicklisp (see my repo git://common-lisp.net/users/frideau/ql-test.git for the helpers I use). I believe it's the fruit of some previous fumbling with a bug, and should be deleted, its contents moved to clear-system.
What about clear-defined-systems (plural)?
This is exported functionality and it calls clear-defined-system.
Should it be changed to clear-systems and made to call clear-system, or kept the same and made to call clear-system?