<p>No, don't drop it. It's still useful if you need to do expansion before calling the expression parser.<br>
I.e. you have either 'expand first, then don't expand in the expression parser' or 'expand in the expression parser':</p>
<pre><code>%define test 1 + 2
%{expr:%test}
# the next line expands twice!
%{expand:%%[ %test ]}
</code></pre>

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