Mailing hash generated that returns true for is_numeric

A mailing hash has been generated (2061002e91909771) that returns true for is_numeric.

This results in viewing the mailing in the browser e.g. via /civicrm/mailing/view?reset=1&id=2061002e91909771 failing.

This is tracked down to civicrm/CRM/Mailing/Page/View.php and the function run that uses a couple of is_numeric checks to determine whether a mailing id or hash has been passed to it via $id.

If such a hash can be generated then the is_numeric checks aren't sufficient. Either the hash generator needs to check that there isn't a single 'e' present (or perhaps no letters at all), or this run function at least needs different checks used. I will be looking at the latter for now.