Just use AsyncIterator<UIntArray>.

The objection is

> The Web streams spec requires promise creation at numerous points — often in hot paths and often invisible to users. Each read() call doesn't just return a promise; internally, the implementation creates additional promises for queue management, pull() coordination, and backpressure signaling.

But that's 95% manageable by altering buffer sizes.

And as for that last 5%....what are you doing with JS to begin with?