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assert(44===0+'44');
$n = $n + $n;
$a = $a + $a;  // array union, by keys not values
Comments by users: Hey the plus sign does work in a URL, wow that defies http://stackoverflow.com/a/11410650/673991 and http://stackoverflow.com/a/15385884/673991 Yay.  (by Bob, Aug 2013)
 
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