Andrew ClarkandGitHub 643e34a591 Allow root params in App Shell (client)
The App Shell is the generic loading state for a route. It does not
depend on concrete param values, so it can be used for every navigation
to a route before its params are known.

We've decided to special case root params: those that appear above the
topmost layout for a given route. These are typically used for params
that are low cardinality for a given session, such as the locale. So we
allow them to appear in the generic part of the UI, even though they
technically might change across pages.

We already treat root params as special during static generation, by
always including them during fallback shell generation. So this decision
is consistent with our existing treatment.

This PR updates the client to key App Shells by their root params.
Currently, the client assumes that the shell never varies on _any_
params. This updates the assumption so that it only applies to non-root
params.
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Next.js

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