Return null values when no answers for nullable fields

[Natim]

With JSONSchema it is possible to set a empty value as Nullable.

{
   "type":"object",
   "properties":{
      "user":{
         "type":"object",
         "properties":{
            "profileType":{
               "type":["string", "null"],
               "enum":[
                  "INTERNAL_SHORT_PROFILE",
                  "EXTERNAL_SHORT_PROFILE",
                  "DEMO_SHORT_PROFILE"
               ]
            },
            "userId":{
               "type":["string", "null"]
            },
            "email":{
               "type":["string", "null"]
            },
            "photoId":{
               "type":["string", "null"]
            },
            "statusPhrase":{
               "type":["string", "null"]
            },
            "country":{
               "type":["string", "null"]
            },
            "city":{
               "type":["string", "null"]
            },
            "company":{
               "type":["string", "null"]
            },
            "jobTitle":{
               "type":["string", "null"]
            },
            "presenceStatus":{
               "type":["string", "null"],
               "enum":[
                  "OFFLINE",
                  "AVAILABLE",
                  "BUSY",
                  "AWAY",
                  "HIDDEN"
               ]
            },
            "emails":{
               "type":"array",
               "items":{
                  "type":"object",
                  "properties":{
                     "email":{
                        "type":["string", "null"]
                     },
                     "validated":{
                        "type":"boolean",
                        "required":true
                     },
                     "default":{
                        "type":"boolean",
                        "required":true
                     }
                  }
               }
            },
            "phones":{
               "type":"array",
               "items":{
                  "type":"object",
                  "properties":{
                     "rawPhoneNumber":{
                        "type":["string", "null"]
                     },
                     "e164PhoneNumber":{
                        "type":["string", "null"]
                     },
                     "validated":{
                        "type":"boolean",
                        "required":true
                     },
                     "validable":{
                        "type":"boolean",
                        "required":true
                     },
                     "default":{
                        "type":"boolean",
                        "required":true
                     }
                  }
               }
            },
            "tags":{
               "type":["array", "null"],
               "items":{
                  "type":["string", "null"]
               }
            },
            "editable":{
               "type":"boolean",
               "required":true
            },
            "firstName":{
               "type":["string", "null"]
            },
            "lastName":{
               "type":["string", "null"]
            },
            "nickName":{
               "type":["string", "null"]
            }
         }
      }
   }
}

When types contains null, we could add a checkbox to let people set the field value to null. If the ckeckbox is checked, the field should not be editable.

[almet]

I don't understand what the value proposition is here. Can you try to describe an use case?