Can you point me to a good explanation of why make_immutable is recommended?
So in an effort to contribute to the Iron Man blogging challenge I have posted a response here. I will copy the "short answer" part of my post here, but for a more detailed and in-depth explanation check out the blog post.
So the short answer is that making your class immutable is good because it memoizes several metaclass methods and installs an optimized constructor and destructor for your class and therefore helps reduce a fair amount of the cost (during runtime) of all the abstraction that the MOP provides.
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