DXN array (@array[ ... ]) — fixed-size, indexed. Wraps an
Elixir tuple, the one DXN collection type where Elixir's own
fixed-arity tuple is actually the right fit — unlike Dextrin.Tuple,
which backs DXN's arbitrary-length tuple with a list instead.
Summary
Types
@type t() :: %Dextrin.Array{items: tuple()}