How Tumblr has developed over time, the importance of continued attention by the developers, and the community consequences of seemingly minor features:
miniblog.
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I love how the CommonMark Spec has a test suite that's just a JSON array. It's really easy to test a library for compliance, and I've seen developers nerd-sniped into full compliance.
https://spec.commonmark.org/0.31.2/spec.json
`init` feels like an unhelpful name in OO. It doesn't give you an initial value, it initialises the instance that has already been created. Developers are often surprised that init doesn't return the instance, because they have a strong association with `new Foo()`.
Perhaps `finish` would have been a less confusing name?
A surprising amount of important software functions by developers doing each other favours by reviewing pull requests.