public Integer getInt(String key) {
        return (Integer) get(key);
    }
Called directly after user configs got parsed (and thus default values got set).
This allows to change default values for "secondary defaults" if required.

@param parsedValues unmodifiable map of current configuration
@return a map of updates that should be applied to the configuration (will be validated to prevent bad updates)
clients/src/main/java/org/apache/kafka/common/config/AbstractConfig.java