default boolean contains(T other) {
        return anyMatch(Predicate.isEqual(other));
    }
Check whether this stream contains a given value.
<p>
<pre><code>
// true
Seq.of(1, 2, 3).contains(2)
</code></pre>
jOOL-java-8/src/main/java/org/jooq/lambda/Seq.java