Ignore members where the member value is the same as the member's default value when serializing objects so that is is not written to JSON, and ignores setting members when the JSON value equals the member's default value.

Ignore members where the member value is the same as the member's default value when serializing objects and sets members to their default value when deserializing.

Include members where the member value is the same as the member's default value when serializing objects. Included members are written to JSON. Has no effect when deserializing.

Members with a default value but no JSON will be set to their default value when deserializing.