Use uint64_t for Tor's hash tables, even if int is 32 bits
64-bit macOS and BSD are LP64, which means that their ints are 32 bits. This makes Tor's hash tables 32 bits, reducing their security.
This issue also occurs on 32-bit systems, where using uint64_t might be slower. I don't know if speed matters, as siphash is 64 bit anyway.
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