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+Speed up attribute access on instances of :mod:`io` classes and their
+subclasses by storing instance attributes and weak references in the object pre-header. The ``__dictoffset__`` and
+``__weakrefoffset__`` attributes of these classes now report the managed offsets, and C extension types that subclass an :mod:`io` class can no longer declare their own ``__dictoffset__`` or ``__weaklistoffset__`` member.
Original file line number	Diff line number	Diff line change
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	`1`	+Speed up attribute access on instances of :mod:`io` classes and their
	`2`	+subclasses by storing instance attributes and weak references in the object pre-header. The ``__dictoffset__`` and
	`3`	+``__weakrefoffset__`` attributes of these classes now report the managed offsets, and C extension types that subclass an :mod:`io` class can no longer declare their own ``__dictoffset__`` or ``__weaklistoffset__`` member.