How do I sum the double values of a map stream in streamex?
<p>The StreamEx library seems to really help me write Java 8 streams concisely, especially when considering maps (using <code>mapKeyValue</code>, for example, instead of having to unbox the map entries manually).</p>

<p>If I have a stream of entries in a map, in vanilla Java 8 I can sum the values this way:</p>

<pre><code>someMap.entrySet().stream()
    .mapToDouble(Entry::getValue)
    .sum()
</code></pre>

<p>and I can do this in StreamEx too, but I expected to see a better way of doing it in StreamEx, though the best I can come up with is:</p>

<pre><code>EntryStream.of(someMap)
    .values()
    .mapToDouble(d -&gt; d)
    .sum();
</code></pre>

<p>which is no better.</p>

<p>Is there a better way I'm missing?</p>