What is waitUntil (Vercel, Cloudflare) and when should I use it?

What is it, when to use it, and when not to use it

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Recently, [Vercel announced](https://vercel.com/changelog/waituntil-is-now-available-for-vercel-functions) that their `waitUntil` utility method is now available for all serverless functions. Now, this useful feature is available for _both_ Vercel's Node.js and edge functions. This utility is not unique to Vercel -- [Cloudflare Workers](https://developers.cloudflare.com/workers/runtime-apis/context/#waituntil) also offers a similar one.

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