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Within `StreamsConfig.java`, DEFAULT_KEY_SERDE_CLASS_CONFIG will default to null and DEFAULT_VALUE_SERDE_CLASS_CONFIG will default to null. That means that the following existing methods will return `null` if no default is set, whereas before they returned byte array.

// Will return null if no default is set through configs
public Serde defaultKeySerde() {
}

// Will return null if no default is set through configs
 public Serde defaultValueSerde() {
}

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