Add integer enforcement when converting to XRP/MPTAmount to Number

include/xrpl/protocol/MPTAmount.h

@@ -64,7 +64,7 @@ public:
 
     operator Number() const noexcept
     {
-        return value();
+        return {value(), Number::strong};
     }
 
     /** Return the sign of the amount */

include/xrpl/protocol/XRPAmount.h

@@ -143,7 +143,7 @@ public:
 
     operator Number() const noexcept
     {
-        return drops();
+        return {drops(), Number::weak};
     }
 
     /** Return the sign of the amount */