notes
https://juxt.pro/blog/posts/datascript-dom.html
http://lambda-the-ultimate.org/node/5169
http://lambda-the-ultimate.org/node/4028
https://infoscience.epfl.ch/record/176887/files/DeprecatingObservers2012.pdf
http://ericniebler.com/2014/11/13/tiny-metaprogramming-library/