review-classifier asked for a test of sw.js's new behaviour. sw.test.mjs loads
the worker in a sandbox with a fake cache and network: the install fetches past
the HTTP cache and keeps every asset, a redirected or refused asset fails it
with a logged reason, a navigation that reaches the network refreshes the cached
entry document, a redirected or failed one does not, and offline a navigation is
answered from the cache.
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