Major Writing a module that send a message like this fails because line 63 of messagelib.php doesn't recognise the userid which comes in as a string.
$eventdata = new stdClass();
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$eventdata->component = 'mod_coursework';
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$eventdata->name = 'deadlinechanged';
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$eventdata->userfrom = $USER;
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// $dbrecord is from a standard $DB->get_record() call
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$eventdata->userto = $dbrecord->studentid;
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// etc
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message_send($eventdata);
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