* Clean up doctests, deny some lints
* Apply suggestions from review.
* replace \" with '
* Fix some more doc examples
* Fix formatting
* Fix some more things
* Remove unused parentheses
* Only test class sig on supported abi/platforms
* Only test class signature on correct versions
* Fix tests to compile on msrv
* msrv strikes yet again
* Add feedback
* Pin `half` to 1.7.1 on msrv