Blocker Description
After making the Schema.Field constructor which takes the default value as a JsonNode was made package private, there is no external way to construct a field that has a default value of 'null'. Internally that constructor will call JacksonUtils.toJsonNode(defaultValue), which will return 'null' when passed null, and the resulting Field will not have a default value (the json node would need to be NullNode instead of simply null itself). This will affect projects that need a way to dynamically build schemas and their fields.