Request: Changing Deserializable to require init? as oppose to init

[peymanmortazavi]

When deserializing, I might pass a completely irrelevant object to init of a deserializable object and they have to handle it. having the option to return nil and say there are not enough information to initialize this object would be great specially since <-- operator does return an optional anyway.

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[isair]

Makes sense. I will commit this change soon.