.</p>
<p>Options:</p>
<ul>
  <li><code>:datatype</code> - One of <code>#{:float64 :string}</code>. Unspecified defaults to <code>:float64</code>.</li>
  <li><code>:algorithm</code> - defaults to :hyper-log-log. Further algorithm-specific options  may be included in the options map.</li>
</ul>
<p>Algorithm specific options:</p>
<ul>
  <li><a href="https://datasketches.apache.org/docs/HLL/HLL.html">:hyper-log-log</a>
    <ul>
      <li><code>:hll-lgk</code> - defaults to 12, this is log-base2 of k, so k = 409