rational: use true min/max values for extended range

Will address issues caused by comparisons to our MIN/MAX constants when
a numerator/denominator is > INT32_MAX/MIN.

app/common/rational.cpp

@@ -229,6 +229,18 @@ bool rational::operator<(const rational &rhs) const
     return false;
   }
 
+  if (rhs == RATIONAL_MAX
+      || *this == RATIONAL_MIN) {
+    // We will always wither be LESS THAN (true) or EQUAL (false)
+    return (*this != rhs);
+  }
+
+  if (*this == RATIONAL_MAX
+      || rhs == RATIONAL_MIN) {
+    // We will always be GREATER THAN (false) or EQUAL (false)
+    return false;
+  }
+
   if (!isNull() && rhs.isNull()) {
     return (numer_ * denom_ < intType(0));
   }
@@ -246,6 +258,18 @@ bool rational::operator<=(const rational &rhs) const
     return true;
   }
 
+  if (rhs == RATIONAL_MAX
+      || *this == RATIONAL_MIN) {
+    // We will always wither be LESS THAN (true) or EQUAL (true)
+    return true;
+  }
+
+  if (*this == RATIONAL_MAX
+      || rhs == RATIONAL_MIN) {
+    // We will always be GREATER THAN (false) or EQUAL (true)
+    return rhs == *this;
+  }
+
   if (!isNull() && rhs.isNull()) {
     return (numer_ * denom_ < intType(0));
   }

app/common/rational.h

@@ -127,9 +127,8 @@ private:
   static intType gcd(const intType &x, const intType &y);
 };
 
-// We define these limits at 32-bit to try avoiding integer overflow
-#define RATIONAL_MIN rational(INT32_MIN, 1)
-#define RATIONAL_MAX rational(INT32_MAX, 1)
+#define RATIONAL_MIN rational(INT64_MIN, 1)
+#define RATIONAL_MAX rational(INT64_MAX, 1)
 
 uint qHash(const rational& r, uint seed);