@andybak , As I was testing draw.path and model.position fixes in the new Beta, I noticed that user.
Also, 0.1 is much thicker in Beta than the Release. They don't match up.
Come to think of it, I was observing a lot of inconsistent behavior for brush size in the Release so much so that I came to find that following command sequence reliably set the brush size to what I expected. I've been using it all over my code.