Return value of UIOP:CALL-WITH-CURRENT-DIRECTORY

Hi asdf developers,

I recently was writing some code with UIOP:CALL-WITH-CURRENT-DIRECTORY and came across something slightly unexpected.

In particular, running CALL-WITH-CURRENT-DIRECTORY or WITH-CURRENT-DIRECTORY forms evaluates to NIL, whereas one may expect that the form evaluates to the return value of THUNK or the macro body, respectively.

In my program, I'm trying to do something like:

(uiop:with-current-directory (dir) (uiop:run-program (list "some" "program") :output :string))

Which doesn't quite do what I want it to do.

I believe this has to do with the definition, which ends in a trailing (chdir dir) form to get out of the directory which unfortunately returns NIL instead of the value from evaluating THUNK.

So my question is: would it be acceptable if a future version of UIOP changes call-with-current-directory to return the value of evaluating THUNK?

Thanks, Kevin