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enableHalt turns on a mode for flight prerenders where aborts are treated like infinitely stalled outcomes while still completing the prerender. For regular tasks we simply serialize the slot as a promise that never settles. For ReadableStream, Blob, and Async Iterators we just never advance the serialization so they remain unfinished when consumed on the client. When enableHalt is turned on aborts of prerenders will halt rather than error. The abort reason is forwarded to the upstream produces of the aforementioned async iterators, blobs, and ReadableStreams. In the future if we expose a signal that you can consume from within a render to cancel additional work the abort reason will also be forwarded there