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[Validator] Add warning about closure not being cachable #15172

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Mar 31, 2021
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[Validator] Add warning about closure not being cachable #15172

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7 changes: 7 additions & 0 deletions reference/constraints/Callback.rst
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Expand Up @@ -251,6 +251,13 @@ constructor of the Callback constraint::
}
}

.. warning::

Using a ``Closure`` together with annotation configuration will disable the
annotation cache for that class/property/methods because ``Closure``s cannot
be cached. For best performance, it is recommended to use a static callback
method.

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