title: Post nested array to Rails
body: <p>How can I post multidimensional array with form to Rails?</p>
  <p>I tried to generate following html:</p>
  <pre><code>&lt;input type=&quot;text&quot; name=&quot;bounds[0][]&quot; value=&quot;&quot;&gt;
  &lt;input type=&quot;text&quot; name=&quot;bounds[0][]&quot; value=&quot;&quot;&gt;
  </code></pre>
  <p>And expected to get nested Array in params Hash:</p>
  <pre><code>{&quot;bounds&quot;=&gt;[[&quot;30.201416&quot;, &quot;50.597186&quot;], [&quot;30.860596&quot;, &quot;50.590212&quot;]]}
  </code></pre>
  <p>But instead Rails parses it as Hash with Stringified keys:</p>
  <pre><code>{&quot;bounds&quot;=&gt;{&quot;0&quot;=&gt;[&quot;30.201416&quot;, &quot;50.597186&quot;], &quot;1&quot;=&gt;[&quot;30.860596&quot;, &quot;50.590212&quot;]}}
  </code></pre>