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attribute by default.
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.. caution::
Usually this has only upsides and few visible effects in everyday
programming. But it *can* lead to some suprising behaviors, so please
make sure to read :term:`slotted classes`.
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- Some options that were only relevant on Python 2 or were kept around for
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For now, please refer to `attr.s` for the rest of the parameters.
.. versionadded:: 20.1.0
.. versionchanged:: 21.3.0 Converters are also run ``on_setattr``.
.. versionadded:: 22.2.0
*unsafe_hash* as an alias for *hash* (for :pep:`681` compliance).
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