default Seq<T> prepend(T other) {
        return Seq.of(other).concat(this);
    }
Concatenate two streams.
<p>
<pre><code>
// (1, 2, 3, 4)
Seq.of(2, 3, 4).prepend(1)
</code></pre>

@see #concat(Stream[])
jOOL-java-8/src/main/java/org/jooq/lambda/Seq.java