We were already asserting that the intmax_t and uintmax_t types are the same as int64_t and uint64_t. Pretty much everywhere in the code base we use the latter types. In principle intmax_t could be something different on some new architecture, and then the code would fail to compile or behave differently. We actually do not want the code to behave differently on those architectures, because that'd break interoperability. So let's just use int64_t/uint64_t since that's what we indend to use.
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