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The Ripple protocol represent transfer rates and trust line qualities as fractions of one billion. For example, a transfer rate of 1% is represented as 1010000000. Previously, such rates where represented either as std::uint32_t or std::uint64_t. Other, nominally related types, also used an integral representation and could be unintentionally substituted. The new Rate class addresses this by providing a simple, type safe alternative which also helps make the code self-documenting since arithmetic operations now can be clearly understood to involve the scaling of an amount by a rate.