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Constructors of ProducerConfig and ConsumerConfig are not public at the moment. This makes it hard to access default values for configurations. For Kafka Streams, we need access to those default value sometime and are forces to hardcode them via "copy and pastpaste". Making constructors public allows programmatic access without the danger to forget updating Streams code in case a producer or consumer default value changes. (Note, AdminConfig constructor is already public.)

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