<p>I looked a bit at the code and $du is not considered anymore, because the next hop address is computed by the c function executed by various modules that send local requests. The event route is executed later, when the transaction structure is already created.</p>
<p>So drop and considering new $du may be made features requests, but they may not be feasible without major changes.</p>
<p>You can document the current behaviour as it is. In the future, when one needs changes in this behaviour, then c code has to be contributed.</p>

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