Parsoid/Changing Parsoid HTML Output

What follows are some conderations for developers when changing Parsoid's HTML output.


 * Parsoid's output is spec'd. Has the spec been updated?  Does the change require version bump?  Generally we have been following semver conventions but haven't been bumping for patch level fixes.
 * Does the content roundtrip? With or without normalizations?  How heavily are we relyion selective serialization?
 * How does the change affect read views?
 * How does it affect editing clients?
 * Does it consider when if the content is templated?
 * Blah blah blah ...