this functionality is controlled by a <a href="/doc/godebug"><code>GODEBUG</code></a> field named <code>gotypesalias</code>.
      With <code>gotypesalias=0</code>, everything behaves as before, and <code>Alias</code> types are never created.
      With <code>gotypesalias=1</code>, <code>Alias</code> types are created and clients must expect them.
      The default is <code>gotypesalias=0</code>.

structurally equivalent; that is, they have the same literal structure and corresponding
components have identical types. In detail:
</p>

<ul>
	<li>Two array types are identical if they have identical element types and
	    the same array length.</li>

	<li>Two slice types are identical if they have identical element types.</li>

structurally equivalent; that is, they have the same literal structure and corresponding
components have identical types. In detail:
</p>

<ul>
	<li>Two array types are identical if they have identical element types and
	    the same array length.</li>

	<li>Two slice types are identical if they have identical element types.</li>