B2Json.constructor (b2-sdk-core 6.4.0-SNAPSHOT API)

```
@Retention(RUNTIME)
@Target(CONSTRUCTOR)
public static @interface B2Json.constructor
```
Constructor annotation saying that this is the constructor B2Json should use. This constructor must take ALL of the serializable fields as parameters.
You must either compile classes with the '-parameters' javac option or else provide a "params" parameter that lists the order of the parameters to the constructor.
If present, the "discards" parameter is a comma-separated list of field names which are allowed to be present in the parsed json, but whose values will be discarded. The names may be for fields that don't exist or for fields marked @ignored. This is useful for accepting deprecated fields without having to use ALLOW_EXTRA_FIELDS, which would accept ALL unknown fields.
When versionParam is non-empty, it is the name of a parameter that is not a field name, and will take the version number being constructed. This should be included for objects that have multiple versions, and the code in the constructor should validate the data based on it.

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element	Description
`java.lang.String`	`discards`
`java.lang.String`	`params`	This is optional for classes compiled with the '-parameters' javac argument
`java.lang.String`	`versionParam`

- Element Detail
  - params
```
java.lang.String params
```
    This is optional for classes compiled with the '-parameters' javac argument
    
    Default:
    
    ""
- - discards
```
java.lang.String discards
```
    Default:
    
    ""
- - versionParam
```
java.lang.String versionParam
```
    Default:
    
    ""