that for arrays and buffers, putting an index that is outside the length of
the data structure will extend the data structure and fill it with <code class="mendoza-code">nil</code>s
in the case of the array, or <code class="mendoza-code">0</code>s in the case of the buffer.
</p>
<p>The last generic function for all data structures is the <code class="mendoza-code">length</code> function.
This returns the number of values in a data structure (the number of keys in a
dictionary type).
</p>
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