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由 Sean Griffin 提交于
When looking for mutation, we compare the serialized version of the value to the before_type_cast form. `Type::Serialized` was breaking this contract by passing the already serialized attribute to the subtype's mutation detection. This never manifested previously, as all mutable subtypes either didn't do anything in their `serialize` method, or had a way to detect double serialization (e.g. `is_a?(String)`). However, now that JSON types can handle string primitives, we need to avoid double serialization. Fixes #24993.
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