title: Does golang have the plan for supporting set datastructure?
body: <p>This feature can be implemented with 'map'.</p>
  <pre><code>countrySet := map[string]bool{
    &quot;US&quot;: true,
    &quot;JP&quot;: true, 
    &quot;KR&quot;: true,
  }
  </code></pre>
  <p>But to ease the eyes of readers, 'set' is a necessary data structure.</p>
  <pre><code>countrySet := set[string]{&quot;US&quot;, &quot;JP&quot;, &quot;KR&quot;}
  </code></pre>
  <p>Does golang have the plan for supporting syntax like this?</p>