It's just the inductive reasoning version of the essay rather than the deductive version. A lot of software exposition fails on that front. If you're familiar

It's just the inductive reasoning version of the essay rather than the deductive version. A lot of software exposition fails on that front. If you're familiar with invariants as a crucial tool for reasoning about software systems, then the essay will be a bit fluffy. It looks decent for a newcomer to the topic to rapidly build up intuition though.