an> marshaller = <span class="hljs-keyword">new</span> Marshaller({onEmpty: <span class="hljs-string">'nullify'</span>});
<span class="hljs-keyword">const</span> marshalled = marshaller.marshallValue(<span class="hljs-string">''</span>); <span class="hljs-comment">// returns {NULL: true}</span>
<span class="hljs-keyword">const</span> unmarshalled = marshaller.unmarshallValue(marshalled); <span class="hljs-comment">// returns null</span>
</code></pre>
				<p>Setting <code>onEmpty</code> to <code>&#39;omit&#3