Red Mum has the scoop, directly from TD Michael Kennedy.
This is a minor release but was prompted by White Shadow. He released a plugin that cleans up expired cache files on a periodic basis instead of after X number of hits. Great minds think alike, (or fools seldom differ) because I had the same idea a few weeks ago and had the code running on this blog for that time without any problems.
The garbage collection system should have operated this way in the first place, but at least now it’s easier to configure.