Check if value tuple is default : <p>How to check if a System.ValueTuple is default? Rough example:</p>

<pre><code>(string foo, string bar) MyMethod() =&gt; default;

// Later
var result = MyMethod();
if (result is default){ } // doesnt work
</code></pre>

<p>I can return a default value in <code>MyMethod</code> using <code>default</code> syntax of C# 7.2. I cannot check for default case back? These are what I tried:</p>

<pre><code>result is default
result == default
result is default(string, string)
result == default(string, string)
</code></pre>
