Adding parenthesis

Author: chdemko

src/BitArray/BitArray.php

@@ -49,14 +49,14 @@ class BitArray implements \ArrayAccess, \Countable, \IteratorAggregate, \JsonSer
 	 * @var  integer[]  Mask for restricting complements
 	 */
 	private static $restrict = [
-		1 << 0 | 1 << 1 | 1 << 2 | 1 << 3 | 1 << 4 | 1 << 5 | 1 << 6 | 1 << 7,
-		1 << 0,
-		1 << 0 | 1 << 1,
-		1 << 0 | 1 << 1 | 1 << 2,
-		1 << 0 | 1 << 1 | 1 << 2 | 1 << 3,
-		1 << 0 | 1 << 1 | 1 << 2 | 1 << 3 | 1 << 4,
-		1 << 0 | 1 << 1 | 1 << 2 | 1 << 3 | 1 << 4 | 1 << 5,
-		1 << 0 | 1 << 1 | 1 << 2 | 1 << 3 | 1 << 4 | 1 << 5 | 1 << 6,
+		(1 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | (1 << 4) | (1 << 5) | (1 << 6) | (1 << 7),
+		(1 << 0),
+		(1 << 0) | (1 << 1),
+		(1 << 0) | (1 << 1) | (1 << 2),
+		(1 << 0) | (1 << 1) | (1 << 2) | (1 << 3),
+		(1 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | (1 << 4),
+		(1 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | (1 << 4) | (1 << 5),
+		(1 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | (1 << 4) | (1 << 5) | (1 << 6),
 	];
 
 	/**