TransformStream creates a readable/writable pair with processing logic in between. The transform() function executes on write, not on read. Processing of the transform happens eagerly as data arrives, regardless of whether any consumer is ready. This causes unnecessary work when consumers are slow, and the backpressure signaling between the two sides has gaps that can cause unbounded buffering under load. The expectation in the spec is that the producer of the data being transformed is paying attention to the writer.ready signal on the writable side of the transform but quite often producers just simply ignore it.
* 时间复杂度：O(len1 + len2)，空间复杂度：O(len2)（栈+Map的空间）
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However Luce said the plan was "clearly not widely supported", and the policy for used vehicles would be changed.
Jan Oberhauser Founder & CEO, n8n
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