Engineer on Chakra here- are these the docs you're looking for? https://msdn.microsoft.com/en-us/library/dn249552(v=vs.94).a...
(I'm guessing this would be at least the milionth time they hear about it :) )
I think the person who wrote this particular page simply didn't specify a friendly name, which is why it's falling back to the canonical name.
Will have a look and compare with the spidermonkey bindings when I get time.
Thanks!