Reviver is a bit of a killer feature for async parsing because it imposes a callback on every key. It makes it difficult to efficiently offload parsing to a worker thread. Without it, feed entries could be parsed and materialized safely (provided GC allows it) in a separate thread and then emitted to the main JS thread.
In our "big JSON feeds" scenarios we never use revivers, and actually I'm not sure we even use them on small JSON payloads. Is this feature really necessary in an async/incremental API variant?
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