it
and saving a new value in the {@link VariableStack} in place of the old one.</p>
<p>The imaginary code above would yield <code>{ value: 4 }</code>, parsing a buffer like this <code>[2]</code>.</p>
<p>Note that all mappers don&apos;t check for existance, validity or other assumptions.
You have to do that yourself with assertions.</p>
<h2 id="when-will-i-be-able-to-access-the-variables---extensions--asserts--amp--mappers-">When will i be able to access the variables? (Extensions, Asserts &amp; Mappers)</h2