Code review comment for ~cjwatson/lazr.config:rhinectomy

$ tox -e coverage
GLOB sdist-make: /home/jugmac00/Projects/lazr.config/setup.py
coverage inst-nodeps: /home/jugmac00/Projects/lazr.config/.tox/.tmp/package/1/lazr.config-2.2.3.zip
coverage installed: coverage==6.1.2,lazr.config @ file:///home/jugmac00/Projects/lazr.config/.tox/.tmp/package/1/lazr.config-2.2.3.zip,lazr.delegates==2.0.4,nose==1.3.7,six==1.16.0,zope.exceptions==4.4,zope.interface==5.4.0,zope.testrunner==5.4.0
coverage run-test-pre: PYTHONHASHSEED='3527834898'
coverage run-test: commands[0] | python --version
Python 3.8.10
coverage run-test: commands[1] | coverage erase
coverage run-test: commands[2] | coverage run -m zope.testrunner --test-path src --tests-pattern '^tests'
Running zope.testrunner.layer.UnitTests tests:
  Set up zope.testrunner.layer.UnitTests in 0.000 seconds.
  Ran 24 tests with 0 failures, 0 errors and 0 skipped in 0.049 seconds.
Tearing down left over layers:
  Tear down zope.testrunner.layer.UnitTests in 0.000 seconds.
coverage run-test: commands[3] | coverage html
Wrote HTML report to htmlcov/index.html
coverage run-test: commands[4] | coverage report -m --fail-under=97
Name Stmts Miss Cover Missing
----------------------------------------------------------------------------------------------------------------
.tox/coverage/lib/python3.8/site-packages/lazr/config/__init__.py 5 0 100%
.tox/coverage/lib/python3.8/site-packages/lazr/config/_config.py 444 12 97% 55-61, 416, 560, 629, 684, 838, 841, 850
.tox/coverage/lib/python3.8/site-packages/lazr/config/_version.py 1 0 100%
.tox/coverage/lib/python3.8/site-packages/lazr/config/docs/__init__.py 0 0 100%
.tox/coverage/lib/python3.8/site-packages/lazr/config/interfaces.py 52 0 100%
.tox/coverage/lib/python3.8/site-packages/lazr/config/tests/__init__.py 0 0 100%
.tox/coverage/lib/python3.8/site-packages/lazr/config/tests/test_config.py 123 11 91% 31-33, 36-38, 154, 163-165, 172, 176-178
.tox/coverage/lib/python3.8/site-packages/lazr/config/tests/test_docs.py 19 0 100%
.tox/coverage/lib/python3.8/site-packages/lazr/config/tests/testdata/__init__.py 0 0 100%
----------------------------------------------------------------------------------------------------------------
TOTAL 644 23 96%
Coverage failure: total of 96 is less than fail-under=97
ERROR: InvocationError for command /home/jugmac00/Projects/lazr.config/.tox/coverage/bin/coverage report -m --fail-under=97 (exited with code 2)
_________________________________________________________________________________ summary _________________________________________________________________________________
ERROR: coverage: commands failed