DXN tuple ({ ... }) — ordered, heterogeneous, arbitrary length.
Wraps a list, not an Elixir tuple: DXN tuples have no fixed arity in
the type system the way Elixir's do, and Dextrin.Array already
claims the Elixir tuple for the one DXN type that actually is
fixed-size/indexed.
Summary
Types
@type t() :: %Dextrin.Tuple{items: [term()]}