SmallDictionary, unlike all subclasses of Dictionary, never used ( and initialize ) the instance variable: &#39;array&#39;.<div>Associations are stored with a key array ( called &#39;keys&#39; ) and a value array ( &#39;values&#39; ).</div>
<div>Problem is that the method #scanFor: is define in Dictionary ( and not overriden ) with this code :</div><div><br></div><div><div>scanFor: anObject</div><div><span class="Apple-tab-span" style="white-space:pre">	</span>| element start finish |</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>finish := array size.</div><div>�� � � �....</div><div><br></div><div>&#39;array&#39; is �nil and it cause bugs for those methods :</div><div><br></div><div>
-&gt; #includesAssociation:</div><div>-&gt; #associationAt:</div><div>-&gt; #associationAt:ifAbsent:</div><div>-&gt; #associationDeclareAt:</div><div><br></div></div>