Promise.all typically resolves when all promises in its array resolve. However, there is an instance where one element of the input array is not a promise https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise/all#Using_Promise.all
This raises the question: can Promise.all accept an array containing only non-promise elements?
Promise.all invokes Promise.resolve on each of the elements passed as arguments before proceeding. If an element is already a promise, no action is taken; if it's a thenable, it will be transformed into a valid promise, and any other type will be encapsulated in a resolved promise.
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