access: a shallow read shows only the way through where the user reads partly

Review 4, F4: `?shallow=true` kept every entry the user may at least pass through, and
a shallow read inlines short scalars' values with their types and sizes. A scalar at a
level a `*` passes through (a capability on `data/*/public`, an entry `data/count:
42`) showed its value though no capability covers it; before `*`, only a scalar where
a capability expected a map did.

Now an entry the user may read only partly is shown only as the way through it is: a
map, with no more than its type (not its size, the number of its keys); anything else
there (a scalar, a list, which a deep read leaves out too) isn't shown. Entries it may
read whole are as they were.

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