キーがシンボルでも文字列でもアクセスできるようにしてくれるっぽい。
<div class="code-block-container"><pre class="language-ruby"><code class="language-ruby">HashWithIndifferentAccess.new(a: 1)['a']
=&gt; 1
</code></pre></div><div class="code-block-container"><pre class="language-ruby"><code class="language-ruby">HashWithIndifferentAccess.new(a: 1)[:a]
=&gt; 1
</code></pre></div>普通のハッシュじゃ無理なこと。
<a href="https://api.rubyonrails.org/classes/ActiveSupport/HashWithIndifferentAccess.html" target="_blank" rel="nofollow noopener noreferrer">ActiveSupport::HashWithIndifferentAccess</a>

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Rails ActiveSupport の HashWithIndifferentAccess って何？

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