Currently, the Avatar property is a string for a path, this is problematic and only support two scenarios (file and uri paths).
I'm requesting that this be changed to be of type ImageSource, which matches the paradigm used by all other Image controls in Xamarin.Forms. This would allow stream and byte sources as well as file and uri paths.
This doesn't have to be a breaking change, you can use an implicit conversion just like Xamarin.Forms Image source does. The only disruption would be if anyone assigned the string value in code instead of a binding.