When fetch() returns a response, the body is a ReadableStream. If you only check the status and don't consume or cancel the body, what happens? The answer varies by implementation, but a common outcome is resource leakage.
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Nature, Published online: 25 February 2026; doi:10.1038/s41586-025-10064-4
At the other extreme: if you’re coding for a space probe on a 50-year mission, almost all errors are expected, including catastrophic hardware failures.