Perf tip: if your web app ships large JSON-like configuration as JavaScript object literals, consider using JSON.parse instead. It’s much faster, especially for cold loads! https://v8.dev/blog/cost-of-javascript-2019#json …pic.twitter.com/p0WICUm7zx
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Dates?
I think devs have to be a lot more discerning than just copy pasting code blindly. In this particular tip @mathias did mention “large JSON-like config” 
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