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This allows to add new kinds of keys that need more data without making KeyValue's footprint bigger for common keys.
This changes the [_symbol] field into [_payload], which holds the same as the previous field for more common keys but can hold bigger objects for keys of the new "Complex" kind.
This also adds a complex key: String keys with a symbol different than the outputted string.
Unit tests are added as the Java language is not helpful in making robust code.