Step 3: cmdChargeCreditCard returned {
This overhead is mandated by the spec's reliance on promises for buffer management, completion, and backpressure signals. While some of it is implementation-specific, much of it is unavoidable if you're following the spec as written. For high-frequency streaming — video frames, network packets, real-time data — this overhead is significant.
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"countDelta": -1
// document_start means these listeners are in place before any element exists
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