htarrow \infty\)</span>, <span class="math display">\[
\text{VonMises}(y|\mu,\kappa) \rightarrow \text{Normal}(\mu, \sqrt{1 /
\kappa}). \]</span> The workaround is to replace <code>y ~ von_mises(mu,kappa)</code> with</p>
<pre><code> if (kappa &lt; 100)
   y ~ von_mises(mu, kappa);
 else
   y ~ normal(mu, sqrt(1 / kappa));</code></pre>

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