json: Pass in QuantityValue instead of double

We use reflection to get the From(value, unit) method,
but this method was recently changed to take a value
of QuantityType instead of double, to use implicit
cast to avoid method overload explosion for all number
types.

Reflection, however, does not do implicit cast so
we update the deserialization code to pass in the proper
type.

Author: angularsen

UnitsNet.Serialization.JsonNet/UnitsNetJsonConverter.cs

@@ -112,11 +112,14 @@ public override object ReadJson(JsonReader reader, Type objectType, object exist
                     !m.ReturnType.IsGenericType);
 #endif
 
+            // Implicit cast: we use this type to avoid explosion of method overloads to handle multiple number types
+            QuantityValue quantityValue = vu.Value;
+
             // Ex: Mass.From(55, MassUnit.Gram)
             // TODO: there is a possible loss of precision if base value requires higher precision than double can represent.
             // Example: Serializing Information.FromExabytes(100) then deserializing to Information 
             // will likely return a very different result. Not sure how we can handle this?
-            return fromMethod.Invoke(null, new[] {vu.Value, unit});
+            return fromMethod.Invoke(null, new[] {quantityValue, unit});
         }
 
         private static object TryDeserializeIComparable(JsonReader reader, JsonSerializer serializer)