<p>Unfortunately, this doesn't work:</p>
<pre><code>$var(delimiter) = ",";                                              
$var(count) = $(hdr(History-Info)[*]{param.count, $var(delimiter)});
</code></pre>
<pre><code>ERROR: pv [pv_trans.c:2631]: tr_parse_paramlist(): invalid separator in transformation: count, $var(delimiter)}
ERROR: <core> [pvapi.c:1629]: tr_lookup(): error parsing [{param.count, $var(delimiter)}]
</code></pre>

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