flatten_map/1 does not flatten lists

[vrcca]

Given the following structure:

%{items: [%{id: 1}, %{id: 2}], another: %{key: :value}}

I would expect the following result:

%{another__key: :value, items__0__id: 1, items__1__id: 2}

But we actually get:

%{another__key: :value, items: [%{id: 1}, %{id: 2}]}

I wonder if we should have a flatten_list/1 and flatten_data/1 which would combine flatten_list + flatten_map.

[nelsonic]

@vrcca great question. Both of these seem like valid use-cases we want to address. 👍