Right now if you use access on a list, it expects it to be a keyword and
requires the value to be an atom.
I've tried to think of a reason why we couldn't support this in the
language, but I haven't been able to. If the value being accessed is an
`integer` it could get the item at that index, and if its an `atom` it
could treat it as a keyword and get the value for that key.
`[1, 2, 3][0] -> 1`
`[foo: :bar][0] -> {:foo, :bar}`
`[foo: :bar][:foo] -> :bar`
`[1, 2, 3][:foo] -> not a keyword list error`
It was pointed out that perhaps we don't do this to express that indexing a
list is not fast in Elixir like it is in other languages, but I'm not sure
if that is sufficient reason IMO to leave out a typically very standard
feature of lists.
Thoughts?
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