It was possible to arbitrarily boost strength (up to its race-specific
limit) by wearing a ring of sustain ability, becoming weak from hunger
(but not actually losing strength due to Fixed_abil), removing the ring,
eating enough to stop being Weak, then repeat as desired. I think you
could substitute polymorph for wearing ring, and rehumanize for removing
ring and get similar results, although that would be more tedious.
My first attempt to fix this was a lot more complicated. This one puts
the temporary strength loss in ATEMP(A_STR) where it carries over from
normal form to polymophed form and back. Fixed_abil doesn't prevent the
loss any more, nor its recovery.
One side-effect of the change is that the possibility of dying when
becoming weak from hunger (if Str gets down to 3, further attempts to
lower it take away HP instead of Str) no longer exists. Using ATEMP()
instead of directly manipulating ABASE() means that current strength is
less but underlying base strength does not actually drop any more.
024e9e1225