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    ],
};
```

The `merge` key supports the resolution mechanism that is pervasive in
[App::Easer][].

The new merging function(s) must support the following signature:

```perl
sub new_merger_default(@list_of_hash_references) { ... }
```

where the input array is the list of hash references to merge, provided
in the same order as the `sources` (but possibly not all of them,
because sources are processed in order).

It is important to consider that the `+Default` source provides a hash
where all the keys are prefixed with the string `//=`, like in this
example: