* Fix#2434
* Treat holes as unkeyed, normalize boolean/null/undefined
This brings a lot better consistency with that API, even though it's
slightly breaking. (I had to update a bunch of tests to correspond with
it.)
* Fill in PR number [skip ci]
* Do not normalise component children on ingestion
* Don't normalise vnode children
* Component hyperscript tests: children aren't normalised
* test, not text
* Update change log: #2155 & #2064
- Remove docs for it
- Remove tests for it
- Add runtime check for unexpected reassignment, since we can't freeze
the property (we internally have to be able to modify it)