B2Json.optionalWithDefault (b2-sdk-core 6.2.1-SNAPSHOT API)

```
@Retention(RUNTIME)
@Target(FIELD)
public static @interface B2Json.optionalWithDefault
```
Field annotation that says a field is optional. When deserializing, the provided default value will be used. The default provided should be the JSON form of the value, as a string. The value will almost always be included when serializing, with two exceptions. If omitNull is true and the value is null, it will be left out of the serialized representation. Similarly, if omitZero is true and the value is zero, it will be left out of the serialized representation. Note that both omitNull and omitZero default to false. A B2JsonException is thrown when omitNull is set to true on a primitive field; primitives are not nullable objects so omitNull does not apply. Similarly, a B2JsonException is thrown when omitZero is set to true on a field that's either non-numeric, non-primitive, or not built into B2Json. Note that they can't both be used on the same field because one only works on non-primitive fields and the other only works on primitive fields.

- Required Element Summary
  
  Required Elements
  Modifier and Type Required Element Description
  
  java.lang.String defaultValue
- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  boolean omitNull
  
  boolean omitZero

- Element Detail
  - defaultValue
```
java.lang.String defaultValue
```
- - omitNull
```
boolean omitNull
```
    Default:
    
    false
- - omitZero
```
boolean omitZero
```
    Default:
    
    false