static <K, V> Seq<Tuple2<K, V>> seq(Map<? extends K, ? extends V> map) {
        if (map == null)
            return Seq.empty();
        
        return seq(map.entrySet()).map(e -> tuple(e.getKey(), e.getValue()));
    }
Wrap a <code>Map</code> into a <code>Seq</code>.
jOOL/src/main/java/org/jooq/lambda/Seq.java