Fix revert issues

include/xrpl/basics/Number.h

@@ -13,6 +13,15 @@ class Number;
 std::string
 to_string(Number const& amount);
 
+template <typename T>
+constexpr bool
+isPowerOfTen(T value)
+{
+    while (value >= 10 && value % 10 == 0)
+        value /= 10;
+    return value == 1;
+}
+
 class Number
 {
     using rep = std::int64_t;
@@ -22,7 +31,9 @@ class Number
 public:
     // The range for the mantissa when normalized
     constexpr static std::int64_t minMantissa = 1'000'000'000'000'000LL;
-    constexpr static std::int64_t maxMantissa = 9'999'999'999'999'999LL;
+    static_assert(isPowerOfTen(minMantissa));
+    constexpr static std::int64_t maxMantissa = minMantissa * 10 - 1;
+    static_assert(maxMantissa == 9'999'999'999'999'999LL);
 
     // The range for the exponent when normalized
     constexpr static int minExponent = -32768;

include/xrpl/protocol/Asset.h

@@ -84,6 +84,12 @@ public:
         return holds<Issue>() && get<Issue>().native();
     }
 
+    bool
+    integral() const
+    {
+        return !holds<Issue>() || get<Issue>().native();
+    }
+
     friend constexpr bool
     operator==(Asset const& lhs, Asset const& rhs);
 

include/xrpl/protocol/STAmount.h

@@ -157,6 +157,9 @@ public:
     int
     exponent() const noexcept;
 
+    bool
+    integral() const noexcept;
+
     bool
     native() const noexcept;
 
@@ -437,6 +440,12 @@ STAmount::exponent() const noexcept
     return mOffset;
 }
 
+inline bool
+STAmount::integral() const noexcept
+{
+    return mAsset.integral();
+}
+
 inline bool
 STAmount::native() const noexcept
 {

src/test/basics/Number_test.cpp

@@ -834,6 +834,7 @@ public:
         }
     }
 
+    void
     run() override
     {
         testZero();