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django__django-14672

Based on the issue description, I need to create a patch for Django's ManyToManyRel class. The issue states that through_fields can be a list, and when hashing the identity property, it fails because lists are unhashable. The solution is…

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Content

Based on the issue description, I need to create a patch for Django's `ManyToManyRel` class. The issue states that `through_fields` can be a list, and when hashing the identity property, it fails because lists are unhashable. The solution is to add `make_hashable` call on `self.through_fields`.

Let me understand the Django codebase structure by looking at the issue. The error trace mentions:
- `/django/db/models/fields/reverse_related.py` - where `ManyToManyRel` and `__hash__` are defined

From the issue, I know:
1. The `identity` property is used for hashing `ForeignObjectRel` objects
2. `ma

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