This week, Chris and Soroush talk about null, the billion dollar mistake. They talk about its past, its present and maybe even its future. Nice!

enum Brain { case small case medium case large case galaxy case universe } * Liskov Substitution Principle * Null References: The Billion Dollar Mistake * Python on Google App Engine * PEP 484: Type Hints * The Definitive Reference To Why Maybe Is Better Than Null * That One Optional Property * The algebra(and calculus!) of algebraic data types * Point-Free episode 4: Algebraic Data Types * Optional definition * SubEthaEdit