about gnome shell notification

Hi All
I hava a question about GNOME SHELL notification DBUS service.
int  /usr/share/gnome-shell/js/ui/notificationDaemon.js file 
function GetCapabilities and GetServerInformation are all return a _javascript_ array, but the function's signature are different:
{ name: 'GetCapabilities',
                inSignature: '', 
                outSignature: 'as'
              { name: 'GetServerInformation',
                inSignature: '', 
                outSignature: 'ssss'
I wonder how the _javascript_ return value of function GetServerInformation be converted to four string?
Any help would be great appreciated! thanks in advance!


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