Re: [whatwg/streams] Synchronous WritableStream Writer to avoid heap allocations from Promises returned by WritableStreamDefaultWriter's write (Issue #1276)

I can confirm that the promises have an effect. I went ahead & implemented a synchronous buffered write using `ArrayBuffer`, `Uint8Array`, & a write queue. I was able to complete the process while limiting memory usage.

This buffered synchronous write is about 10x slower than Nodejs's Writer write approach.

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