Wiki page list , ShowHiddenInTableOfContents = true

Hi,

I tried to add , ShowHiddenInTableOfContents  to $core_v2_wikiPage.List APi.

i tried as 

$query.Add("ShowHiddenInTableOfContents", true)

$query.Add("ShowHiddenInTableOfContents", 'true')

$query.Add("ShowHiddenInTableOfContents", 1)

even I tried adding #set ($query = "%{ PageSize = $pageSize, PageIndex = $pageIndex, ShowHiddenInTableOfContents = 'true' }")

in all the cases it throwing error as

UnknownException: An error occurred while rendering the 'Content' script from the widget 'Wikis - Page List' (6fe4c6b4f6f44c2b817d671c168fa6f0) (An error occurred while trying to render a widget. Details of the issue were logged for review by the administrator.) ---> NVelocity.Exception.MethodInvocationException: Invocation of method 'List' in  Telligent.Evolution.Wikis.Plugins.WidgetApi.WikiPages threw exception System.FormatException : String was not recognized as a valid Boolean. ---> System.FormatException: String was not recognized as a valid Boolean.
   at System.Boolean.Parse(String value)
   at Telligent.Evolution.Wikis.Plugins.WidgetApi.WikiPages.List(Int32 wikiId, IDictionary options)
   --- End of inner exception stack trace ---