But it's just a programming language. Programming Rust does not mean I have to:
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No custom ReadableStream class with hidden internal state. A readable stream is just an AsyncIterable. You consume it with for await...of. No readers to acquire, no locks to manage.
// Storage write is slow — meanwhile, the entire stream
A difficulty here, however, is that the TransformStreamDefaultController does not have a ready promise mechanism like Writers do; so the TransformStream implementation would need to implement a polling mechanism to periodically check when controller.desiredSize becomes positive again.