Looking at various stackoverflow answers and kendo forum posts I can see people talking about using Kendo js library methods like : 
kendo.toString() and kendo.stringify(). 

Where is the documentation for this ?? I have searched the docs and see nothing of this nature. Is this a hidden unsupported part of kendo ui ? 

Hello,

kendo.toString is documented in the globalization section of our help docs. The stringify method belongs to the JSON object, and it is only implemented for browsers that do not support it. 

Kind regards,
Petyo
the Telerik team