"size_t" isn't always 64 bit, it is 32 bit on 32 bit systems. All printf style statements that were assuming size_t were 64 bit were changed, and they were also changed to display them as unsigned values as "size_t" isn't signed.

If you print anything with 'size_t', please cast it to "uint64_t" in the printf and use PRIu64 or PRIx64.