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          Making a radix sort
          stable requires the usage of an external copy of the data. A stable hybrid
          algorithm also requires a stable comparison-based algorithm, and these
          are generally slow. LSD radix
          sort uses an external copy of the data, and provides stability,
          along with likely being faster (than a stable hybrid sort), so that's probably
          a better way to go for integer and floating-point types. It might make
          sense to make a stable version of string_sort