Congratulations on the first release

I've had a very light skim read of the doc (definitely missing out point 6 )

I've not installed the preview

In the section that is called "Strings for Binary Data" it says we should use UChar arrays.

Does that mean things like cHTTPTransfer have a new interface for OnDataReceived, HttpPostRequest etc or they are staying as is for the short term for backward compatibility and we just have to move them to UChar[] straight away before doing anything with them or back the other way to pass them out