The MuxAsyncIterator class multiplexes multiple async iterators into a single stream. It currently makes a few assumptions:

• The iterators do not throw.
• The final result (the value returned and not yielded from the iterator) does not matter; if there is any, it is discarded.

Collects all Uint8Arrays from an AsyncIterable and retuns a single Uint8Array with the concatenated contents of all the collected arrays.

Creates a Promise with the reject and resolve functions placed as methods on the promise object itself. It allows you to do: