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Types being referred to by non-canonical names can be confusing. For example,
```java
public final class Entries {
private final ImmutableList<ImmutableMap.Entry<String, Long>> entries;
public Entries(Map<String, Long> map) {
this.entries = ImmutableList.copyOf(map.entrySet());
}
}
```
There is nothing special about `ImmutableMap.Entry`; it is precisely the same
type as `Map.Entry`. This example makes it look deceptively as though
`ImmutableList<ImmutableMap.Entry<?, ?>>` is an immutable type and therefore
safe to store indefinitely, when really it offers no more safety than
`ImmutableList<Map.Entry<?, ?>>`.
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