Coverage branches instead of arcs

from blog Ned Batchelder's blog, | ↗ original
As I mentioned in a few recent posts, I’ve been working on some significant work in coverage.py to take advantage of new capabilities in Python.Mark Shannon has been improving the sys.monitoring API so that branch coverage can be done with low overhead. I want to take advantage of that in coverage.py, but I needed to do some refactoring work...