django__django-16873

This repository doesn't contain the Django source code. Based on my knowledge of Django's codebase and the issue description, I can provide the fix. The issue is in the `join` filter in `django/template/defaultfilters.py`. 

Looking at the Django source code and the issue:
1. The `join` filter always escapes the joining string using `conditional_escape(arg)` 
2. But when `autoescape` is off, the joining string should not be escaped

The current implementation looks something like:
```python
@register.filter(is_safe=True, needs_autoescape=True)
def join(value, arg, autoescape=True):
    """Join

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