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Specify what happens in the case of object comparisons #1783

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Specify what happens in the case of object comparisons #1783

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4 changes: 4 additions & 0 deletions source/reference/operator/update/addToSet.txt
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Expand Up @@ -63,6 +63,10 @@ Behavior
array as a *single* element. To add each element of the value
separately, use :update:`$addToSet` with the :update:`$each`
modifier. See :ref:`addToSet-modifiers` for details.

- If the value is an object, it will be deep-compared with every
element in the array. It is currently not possible to specify
particular keys to match against or ignore.

.. _addToSet-modifiers:

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