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According to the R 'Memory-limits' documentation, it isn't possible to allocate a vector of length longer than 2^31-1. This is because the integer used as an index can only use 31 bits (one bit for the sign). But on a 64-bit system, I should be able to allocate longer vectors. Why does R impose this same max length on 64-bit systems? Is there a way to circumvent the limit?