/code></strong></dt>
<dd>the index of the result to use, if there is more than one (default: 0)</dd>
<dt><strong><code>matchidx</code></strong></dt>
<dd>the index of a matching info element to use, if more than one matches exist
with the given name (default: 0)</dd>
<dt><strong><code>silent_fail</code></strong></dt>
<dd>if True, do not raise an exception if the features cannot be updated</dd>
<dt><strong><code>deepcopy</code></strong></dt>
<dd>if True, existing features are deep-copied, otherwise a shallow 