New coverage report, as there have been a bunch of new tests since the
one in the CONTRIBUTING file was generated:
54% expressions used (4311/7948)
51% boolean coverage (67/131)
47% guards (50/106), 31 always True, 6 always False, 19 unevaluated
57% 'if' conditions (11/19), 2 always True, 1 always False, 5 unevaluated
100% qualifiers (6/6)
61% alternatives used (413/671)
83% local declarations used (212/254)
28% top-level declarations used (313/1099)
