planner-tasks-file-behavior?

I had planner-tasks-file-behavior set to 'save, and I just upgraded to
Planner 3.40 (from a very old version), and now when I type M-x plan,
planner seems to spend an inordinate amount of time fontifying
buffers.  Previously, this was because when it updated a task, it
opened the file, fontified the buffer, and then closed it again,
repeatedly.  Setting planner-tasks-file-behavior to 'save fixed this
for me, but now the upgrade has apparently broken it again.

Is my expectation still the intended behavior of
planner-tasks-file-behavior?  From the docstring and the info file,
one would conclude yes.  From the source code, I only see tests like
'(if (equal planner-tasks-file-behavior 'save) ... )' and 
'(when planner-tasks-file-behavior ...)' which would seem to imply
that no special behavior is implied by a value of 'save.
(Incidentally, that test could be (eql planner-tasks-file-behavior
'save), correct?)  

It this is still the intended behavior, has anyone else experienced
this problem?  Is it a known bug?  

Thanks,
Greg