A fair point on the title! I think you can see it from both perspectives. When I chose the title, I was thinking of "untangling" in this sense: In the traditional C program that overuses malloc/free, you end up in a forest of dynamic lifetimes all "tangled together". So, arenas are useful in "untangling those", in the same way that you might untangle cables for your PC by bundling them together.
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