haystack

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---
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preview:
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  - |
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    Refactor `Document.__eq__()` so it compares the `Document`s dictionary
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    representation instead of only their `id`.
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    Previously this comparison would have unexpectedly worked:
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    ```python
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    first_doc = Document(id="1", content="Hey!")
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    second_doc = Document(id="1", content="Hello!")
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    assert first_doc == second_doc
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    first_doc.content = "Howdy!"
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    assert first_doc == second_doc
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    ```
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    With this change the last comparison would rightly fail.
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