Null pointers are the billion dollar mistake

@davetchepak "What can C# do that F# cannot?"
NullReferenceException :-)

Educating the imperative gorillas about sum types:

https://chadaustin.me/2015/07/sum-types/

What's curious is that the languages with sum types totally allow accessor functions and even C-like tagged union. But no one uses them, it's considered bad style and so unidiomatic. I've yet to see someone who prefers not to use pattern matching when it's available.