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JsonNullable wrapper class and Jackson module to support fields with meaningful null values.

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package org.openapitools.jackson.nullable;

import com.fasterxml.jackson.databind.BeanDescription;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.MapperFeature;
import com.fasterxml.jackson.databind.SerializationConfig;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
import com.fasterxml.jackson.databind.ser.Serializers;
import com.fasterxml.jackson.databind.type.ReferenceType;

public class JsonNullableSerializers extends Serializers.Base {

    @Override
    public JsonSerializer findReferenceSerializer(SerializationConfig config,
                                                     ReferenceType refType, BeanDescription beanDesc,
                                                     TypeSerializer contentTypeSerializer, JsonSerializer