Allow null string values
There is a difference between "null" and null in both JSON and YAML, currently this difference is ignored and all null values are parsed as the string "null".
@@ -846,7 +846,7 @@ public class OpenAPIDeserializer {
}
} else if (!v.isValueNode()) {
result.invalidType(location, key, "string", node);
- } else {
+ } else if (!v.isNull()) {
value = v.asText();
if (uniqueValues != null && !uniqueValues.add(value)) {
result.unique(location, "operationId");
