includeIfNull property Null safety
final
Whether the serializer should include the field with null value in the
serialized output.
If true, the serializer should include the field in the serialized
output, even if the value is null.
The default value, null, indicates that the behavior should be
acquired from the ResponseModel.includeIfNullField annotation on the
enclosing class.
Implementation
final bool? includeIfNull;