Priority support
The Web streams spec requires promise creation at numerous points — often in hot paths and often invisible to users. Each read() call doesn't just return a promise; internally, the implementation creates additional promises for queue management, pull() coordination, and backpressure signaling.
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Better accuracy than RNNT
Also, by adopting gVisor, you are betting that it’s easier to audit and maintain a smaller footprint of code (the Sentry and its limited host interactions) than to secure the entire massive Linux kernel surface against untrusted execution. That bet is not free of risk, gVisor itself has had security vulnerabilities in the Sentry but the surface area you need to worry about is drastically smaller and written in a memory-safe language.