Worthwhile article on considering PL creation as a design process: https://tomasp.net/blog/2017/design-side-of-pl/
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@krinkle A surprising number of PL design workarounds are "just add another equals sign" 🙃
I'm a huge fan of Swift's 'Error Handling Rationale' design document: https://github.com/swiftlang/swift/blob/9315673c003875158852579bd1f33480cdec5461/docs/ErrorHandlingRationale.md#fundamentals
It carefully defines terminology and compares with other languages, so you can understand Swift's position and preference in the design space.
Deno has the cutest PL mascot I think I've ever seen. Are there any other contenders?