title: How to store a multidimensional array in an Ecto schema?
body: <p>Say I wish to store a set of coordinates (<code>[[x1,y1], [x2,y2]]</code>) into Postgres. What is the preferable datatype? The docs allow for arrays in the form of</p>
  
  <pre><code>:coordinates, {:array, :float}
  </code></pre>
  
  <p>But this is only useful for one-dimensional arrays.</p>