Commit history from pyyaml, as far as I can tell, http://pyyaml.org/log/ <img width="733" alt="screen shot 2017-07-05 at 10 34 54 am" src="https://user-images.githubusercontent.com/123560/27858562-9e33dc44-616d-11e7-9525-0cf771d24b31.png"> Commit history from `ruamel.yaml`, https://bitbucket.org/ruamel/yaml/commits/all <img width="1355" alt="screen shot 2017-07-05 at 10 35 36 am" src="https://user-images.githubusercontent.com/123560/27858592-bd36de8e-616d-11e7-8213-548f81909bd2.png"> ruamel.yaml supports yaml 1.2, and handles round-trip, including comments.