An ES-spec-compliant shim/polyfill/replacement for the `.cause` property on all Error types that works as far down as ES3
ES Proposal spec-compliant shim for AggregateError
Polyfill `error.cause`
Await an array of promises to be settled, then reject with an AggregateError upon failure, or resolve with an array of values upon success.
utilities and polyfill for node.js errors
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