[Bug] no attribute default_value

[rmm286]

Context
I am a first time user to blender scripting. I am working with Blender 2.82 (sub 7) (2.82.a+dfsg-1). I am on Ubuntu 20.04.

Whats Wrong
When running several of the scripts following the Readme, including simple_sphere.py and fisher_iris_visualization.py, I am getting an Attribute Error on default_value.

AttributeError: 'NodeSocketShader' object has no attribute 'default_value'

Expected Behavior
When I checkout 8359200, I am able to run the script successfully.

Looks like this is a recent change so I assume I am doing something wrong, I made sure blender was updated and ran it using the command given on the readme, but I am not sure what I might be doing wrong.