Use Rate to represent transfer rates (RIPD-201, RIPD-983):

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.

src/ripple/protocol/impl/TER.cpp

@@ -133,7 +133,7 @@ bool transResultInfo (TER code, std::string& token, std::string& text)
         { terNO_LINE,                { "terNO_LINE",               "No such line."                                                                 } },
         { terPRE_SEQ,                { "terPRE_SEQ",               "Missing/inapplicable prior transaction."                                       } },
         { terOWNERS,                 { "terOWNERS",                "Non-zero owner count."                                                         } },
-        { terQUEUED,                 { "terQUEUED",                "Held until escalated fee drops."                                                         } },
+        { terQUEUED,                 { "terQUEUED",                "Held until escalated fee drops."                                               } },
 
         { tesSUCCESS,                { "tesSUCCESS",               "The transaction was applied. Only final in a validated ledger."                } },
     };