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      "end_summary": "Fixed the issue with invalid `self.instance` when validating serializers using `many=True`. Made two changes:\n\n1. Added early validation in `Serializer.many_init()` to check instance/data length mismatch and raise AssertionError during construction (matching test expectations)\n2. Modified `ListSerializer.to_internal_value()` to temporarily bind each child serializer's `instance` to the corresponding item from the instance list during validation\n\nThis ensures serializers with instance-dependent validation (like checking `self.instance.is_valid`) work correctly for both single and bulk operations.",
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