This is a major version upgrade from 3.5.3 to 4.0.0 that introduces significant breaking changes.

Key Changes:

• Binary Incompatibility: The 4.0.0 release is not binary compatible with the 3.x series. Downstream projects have explicitly noted this breakage.
• Significant API Discrepancies: There are major differences in API behavior between the 3.x and 4.x versions. The changes were substantial enough that Databricks noted significant discrepancies and chose to downgrade from json4s 4.x back to a 3.x version in their runtime to maintain compatibility.
• Potential Core API Changes: Discussions leading up to this major version indicated potential redesigns of core data structures, such as changing JObject from using a List to a Map and altering the collection type for JArray. Such changes would require significant code refactoring for anyone interacting directly with the JSON AST.

Recommendation: Due to the high likelihood of breaking API and binary compatibility changes, this upgrade requires a thorough code review and refactoring effort. Developers should carefully test all JSON parsing, serialization, and AST manipulation logic.

Notice 🤖: This content was augmented using artificial intelligence. AI-generated content may contain errors and should be reviewed for accuracy before use.

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