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These are Python 3.6+-only and keyword-only APIs that call `attr.s` and
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exactly like `attr.s`. If left `None`, `attr.s` will try to guess:
1. If any attributes are annotated and no unannotated `attr.ib`\ s
are found, it assumes *auto_attribs=True*.
2. Otherwise it assumes *auto_attribs=False* and tries to collect
`attr.ib`\ s.
and that mutable classes (``frozen=False``) validate on ``__setattr__``.
.. versionadded:: 20.1.0
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.. versionadded:: 20.1.0
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