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Being an ARC backed array isn't like std::string, and I don't see why having that copy-on-write behaviour implies it is fundamental. Could you expand?

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In pre C++11 it was quite typical for std::string to be implemented with COW semantics. Since C++11 standard it is no longer permitted, though it is not necessarily reflected in all stdlib implementations.

This is my mistake. I assumed shared pointer semantics and applied it to the wrong type :\

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