Skimming the docs, it's interesting to see that they allow you to return values inside a void function: https://sorbet.org/docs/sigs
The value is thrown away by their signature wrappers though.
miniblog.
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Skimming the docs for lens.js: https://www.npmjs.com/package/safety-lens makes lenses look rather like lisp's setf to me. Is this superficial or deep?