 a decoder function which restores the captured semantics in the extent of its call.  The <code class="arg-name">keys</code> must be valid indicators of custom variables.  If some <code class="arg-name">keys</code> are supplied then the values of only the corresponding variables are captured; otherwise the values of all
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custom variables are captured.</p>
</div>


<p>The following example demonstrates how a simplified version of the macro <a href="#JSON-BIND"><code class="api-name">json-bind</code></a> ca