TypeMismatchError on post
<p>I'm writing an <code>aurelia</code> application with <code>aurelia-fetch-client</code> library.
When I try to post an object to my api service I get the error:</p>

<blockquote>
  <p>TypeMismatchError </p>
</blockquote>

<p>In console only from Edge. Other browsers (Chrome, Firefox and IE11) have no problems. There are no description or any other details about it. </p>