While I don't know exactly what parts were inherited, I have looked at parts of the code that definitely was not inherited from Bell Labs (for features that are comparatively new) and they are also very nice to read.
Perhaps they just followed in the footsteps of the masters, but whatever the reason, the code is, in opinion, incredibly nice to work with.
Perhaps they just followed in the footsteps of the masters, but whatever the reason, the code is, in opinion, incredibly nice to work with.