@Override
    public Seq<T> onClose(Runnable closeHandler) {
        return Seq.seq(stream.onClose(closeHandler));
    }
Always returns false. Seq streams are always sequential and, as such,
doesn't support parallelization.

@return false
@see <a href="https://github.com/jOOQ/jOOL/issues/130">jOOL Issue #130</a>
jOOL-java-8/src/main/java/org/jooq/lambda/SeqImpl.java