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- before 4.0, users can keep using the deprecated kafka.serializer.Decoder
- after 4.0, all users need to update superclass from kafka.serializer.Decoder to
org.apache.kafka.tools.api.Decoder. They have same method, but the new constructor does not accept VerifiableProperties now. Hence, users' custom decoders have to offer default constructor - before 4.0, users can access both interfaces by depending on core module.
- after 4.0, users need to import tools-api module if core module is gone
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