Test whether a value is a string in Coldfusion
<p>I have a struct that I check for the existence of a key.  I then need to test whether the value for that key is a string.  I didn't spot anything in the Adobe CF docs like an <code>isString()</code> function (similar to <code>isNumeric()</code>).  </p>

<p>Is there a good way other than using the seemingly broader <code>isSimpleValue()</code>?</p>