default <U> Seq<U> scanLeft(U seed, BiFunction<? super U, ? super T, ? extends U> function) {
        return scanLeft(this, seed, function);
    }
Scan a stream to the left.
<p>
<pre><code>
// ("", "a", "ab", "abc")
Seq.of("a", "b", "c").scanLeft("", (u, t) -> u + t)
</code></pre>
jOOL/src/main/java/org/jooq/lambda/Seq.java