ode> is an immutable container for 1D homogeneous data which is indexed by a
an associated sequence of keys.</p><p>Both the index and value data are backed by arrays.</p><p><code>Series</code> is effectively an associative map whose keys have an ordering provided by
the natural (provided) order of the backing array.</p><p>Several element access methods are provided.</p><p>The <code>apply</code> method returns a slice of the original Series:</p><pre><span class="kw">val</span> s = Series(Vec(<span class="num