default Seq<T> cycle() {
        return cycle(this);
    }
Repeat a stream infinitely.
<p>
<pre><code>
// (1, 2, 3, 1, 2, 3, ...)
Seq.of(1, 2, 3).cycle();
</code></pre>

@see #cycle(Stream)
jOOL/src/main/java/org/jooq/lambda/Seq.java