FasterXML / FasterXML/jackson-databind
Allow JsonDeserializer to provide default value for "missing" properties
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Description
This came up in https://github.com/FasterXML/jackson-datatype-jdk8/issues/2
When deserializing a bean containing `Optional` fields, the value `Optional.empty()` makes more sense than filling in `null` for properties that are entirely missing from the JSON.
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