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Recently-added code was written largely by copying existing practices in various places. In particular, much of the original code was using `UV` typed variables to store sizes and indexes in various list or array structures, counts of parameters, and so on. On fully 64-bit platforms this is all fine, but on 32-bit platforms with -Duse64bitint enabled, this is a 64-bit integer that won't ever be counting that high. These values might as well be stored as 32-bit integers in that case.