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a71e4086a2
This removes the last use of `strdup` This required making a lot of related pointers be `const`. That in turn conflicted with the need to `munmap()` a pointer eventually, which was similar to the need to eventually `free()` an `Expansion`'s contents, so I used the same solution of a `union`. That lets us normally use the `const` pointer for `const` correctness, and the non-`const` one for the not-really- mutating destruction cases.