Entirely replaces foo() with a new function that isn't part of the original program, but instead is written to the process memory on-the-fly while it's running.
distance = np.linalg.norm(rgb - background, axis=2)
，这一点在新收录的资料中也有详细论述
p.address.city = "Tacoma";
Region system adopted from ModernUO (chosen as the most robust baseline), including polymorphic JSON loading via $type.