t has each bit set to <code>1</code> where <em>one or the other but not both</em> of
its operators has that bit set to <code>1</code>. This is equivalent to the
symmetric difference of two sets. For example:</p>

<pre><code class="language-swift">let x: UInt8 = 5        // 0b00000101
let y: UInt8 = 14       // 0b00001110
let z = x ^ y           // 0b00001011</code></pre>

<p>Performing a bitwise XOR with a value and <code>allZeros</code> always returns the
same value:</p>

<pre><code class="language-swift">