Neat! I particularly like how you walk us along with your investigation; I didn't know about `memsize_of`. Reminds of an "issue" I ran into a while, where Time

Neat! I particularly like how you walk us along with your investigation; I didn't know about `memsize_of`. Reminds of an "issue" I ran into a while, where Timecop doesn't affect file timestamps, because those are pulled from the OS rather than Ruby.