A Fifth Object Shape Made the Same Loop Twice as Slow

<p>Same loop, same array length, same field. One line changes between these two runs: how many kinds of object are in the array.<br> </p> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code>4 shapes: 1.51 ns per read 5 shapes: 3.31 ns per read </code></pre> </div> <p>The loop is one property read:<br> </p> <div class="highlight js-code-highlight"> <pre class="highlight

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