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AI-generatedDuplicate object keys handling change with Jackson 2.13 FAIL_ON_READING_DUP_TREE_KEY
The goal is to define a consistent duplicate-key policy for JSON objects consumed across services that use different parsers and library versions. RFC 8259 does not prescribe how duplicate object keys must be handled, leaving the behavior implementation-specific. The compatibility boundary centers on Jackson 2.13, which added the mapper feature FAIL_ON_READI