Why isn't `Promise.all()` overloaded?

[Jacob Pratt]

This is potentially a very simple question, `Promise.all()` takes a single
iterable as a parameter. Is there any particularly reason it wasn't
overloaded to allow passing multiple parameters (and use `...arguments`)?
Of course, the only difference is the creation of an array, but it *is* an
array that doesn't need to be created.

Jacob Pratt
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