Test ++ and -- handling

Author: hikari-no-yume

Zend/tests/trailing_whitespace_numeric_strings.phpt

@@ -42,6 +42,14 @@ foreach ($strings as $string) {
     takes_float($string);
     \assert(\intdiv($string, 1) === 123);
     \assert(\is_numeric($string));
+    $incremented = $string;
+    ++$incremented;
+    \assert(\is_int($incremented) || \is_float($incremented));
+    \assert($incremented == 124);
+    $decremented = $string;
+    --$decremented;
+    \assert(\is_int($decremented) || \is_float($decremented));
+    \assert($decremented == 122);
 }
 
 echo "OK!", PHP_EOL;