At http://ift.tt/1o9Eacl the comment for the parameter reads


Code:



* @param {String} The overall direction to group the data by. Defaults to the value of {@link #groupDir}.

This results naming the second parameter "The" in the docs and not marking it as an optional parameter

The code should read thus



Code:



* @param {String} [direction] The overall direction to group the data by. Defaults to the value of {@link #groupDir}.