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The signed and unsigned fixed-width integers (int32_t, uint32_t etc.) are optional in C99 (and above). Use the non-optional minimum-width integers (int_fast32_t, uint_fast32_t and int_least32_t, uint_least32_t etc.) instead. To simulate unsigned wrap-around, use the GUF_UWRAP macros in guf_common.h cf. https://en.cppreference.com/w/c/types/integer (last-retrieved: 2025-05-18)