I picked up a stone knife and headed a few spaces south, where I met a Giant Rat.  We fought back and forth for some dozens or hundreds of attacks, hitting, missing and parrying, but seemed unable to make any progress.  I think we were healing faster than we could damage each other.  In fact, I started the combat (and the game, actually) as Wounded, and before I got bored and wandered away, I had actually healed to Healthy, and the Giant Rat was only Sad and Tired.

Seems a little strange to have this sort of stalemate in a combat situation.

Thanks for letting me know, Mochnant! I just uploaded a build with an updated method of handling damage calculations that should help alleviate issues like the ones your described.

That's great, thanks for the quick reply and enhancement!