Why not use null instead of N/A?

[ghost]

trafficstars

Often when a field is missing data, it returns a string "N/A" instead of null. Isn't it better to use null when data is missing? If a field is always an integer (like metacritic score), I can't deserialize the field to an integer in my project, because the field might be a string ("N/A").

Is there a reason for the use of "N/A" as a string everywhere instead of null?

[omdbapi]

This is being addressed in the new JSON response.