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How can I bypass `JsonNamingStrategy.SnakeCase` when I have a `@SerialName` annotation ? I really need this as I need to conform to a JSON where everything is snake_case except one field (maybe an error from the API but I have no choice)

Unfortunately you can't do it as-is, as serial names are also transformed. You can, however, implement your own `JsonNamingStrategy` and check `descriptor.serialName` and property `serialName` to determine whether it should be transformed (and delegate to `SnakeCase` later)

Or implement your own exclusion annotation, as in here: <https://github.com/Kotlin/kotlinx.serialization/blob/60c632c970d7da02151fd7c920f40ebc269c0f29/formats/json-tests/commonTest/src/kotlinx/serialization/features/JsonNamingStrategyExclusionTest.kt#L15>