[pull] canary from vercel:canary #720
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During a Full prefetch (`<Link prefetch={true}>`), check the bfcache for
matching segment data before issuing a new request. The bfcache stores
data from previous navigations, which always includes dynamic data.
This optimization avoids redundant server requests when the user has
already navigated to a route and the data is still fresh according to
the staleTimes.dynamic configuration.
This change adds infrastructure for a planned client-side optimization where the router can infer route structure from previously prefetched routes, avoiding redundant route tree requests. When the client prefetches /blog/post-1 and learns the route structure is /blog/[slug], it could potentially reuse that knowledge for /blog/post-2 without another server roundtrip. However, if a static route like /blog/featured exists at the same level, the client needs to know NOT to apply the dynamic template for that URL. staticSiblings provides this information. When a dynamic segment like [slug] has static siblings (e.g., "featured", "archive"), the server includes them in the prefetch response. The client can then check whether an incoming URL matches a known static sibling, and if so, recognize that the previously learned route structure does not apply.
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