The handling of endptr in DYN_ARR_RESIZE seems to be incorrect. If I have an array with 2 elements and capacity of 3 and I DYN_ARR_RESIZE it to 5, I now have an array with 5 elements, 3 of which are garbage values.
Nevermind, I see how it's supposed to work now.
To your point, `RESIZE` is definitely incorrect. It should be checking the length before calling `realloc`.
Why do you say this is wrong? That's exactly what I would expect.
Exposing uninitialized memory as valid values tends to be a really bad idea.
this somewhat mirrors what happens with a std::vector when you call resize() except of course c doesn't have default ctors. the point of resize is to make exactly "size" elements of the dynamic array addressable.