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   func (ns NullString) MarshalJSON() ([]byte, error) {
       if !ns.Valid {
           return []byte("null"), nil
       }
       return json.Marshal(ns.String)
   }
It would render `user_id: null` instead of `user_id: ""` which should work, I think.


sure it's valid JSON, but it really depends on the API as to whether it handles null values properly when it's expecting some other type. I honestly haven't tried that with the GitHub API, but based on what I've seen it probably handles it fine. Others may not.


And this is the problem about using null as a valid state for data. In many languages, using null as a valid data value just can cause all kinds of problem (extra checks, not supported, or problems accessing null data).




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