n="true" tabindex="-1"></a><span class="co">#&gt; 6 NA    y</span></span></code></pre></div>
<p>There are three ways to proceed, each of which has some downside:</p>
<ul>
<li><p>Specify <code>guess_max = Inf</code>, just like we do for the second edition parser.</p>
<p>Since readr does not know how much data it will be processing, the first edition engine pre-allocates a large amount of memory in the face of this uncertainty. This means that reading with <code>guess_max = Inf</code> can be extremely slow an