--- /dev/null
+--TEST--
+--FILE--
+<?php
+
+echo "==Mixed==\n";
+$a = array(-1=>'a', '-2'=>'b', 3=>'c', '4'=>'d', 5=>'e', '6001'=>'f', '07'=>'g');
+
+foreach($a as $k => $v) {
+ var_dump($k);
+ var_dump($v);
+}
+
+echo "==Normal==\n";
+$b = array();
+$b[] = 'a';
+
+foreach($b as $k => $v) {
+ var_dump($k);
+ var_dump($v);
+}
+
+echo "==Negative==\n";
+$c = array('-2' => 'a');
+$c[] = 'b';
+
+foreach($c as $k => $v) {
+ var_dump($k);
+ var_dump($v);
+}
+
+echo "==Done==\n";
+?>
+--EXPECT--
+==Mixed==
+int(-1)
+string(1) "a"
+int(-2)
+string(1) "b"
+int(3)
+string(1) "c"
+int(4)
+string(1) "d"
+int(5)
+string(1) "e"
+int(6001)
+string(1) "f"
+string(2) "07"
+string(1) "g"
+==Normal==
+int(0)
+string(1) "a"
+==Negative==
+int(-2)
+string(1) "a"
+int(-1)
+string(1) "b"
+==Done==