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gh-145300: Document bytearray.extend() behavior when mutating during … #145637

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11 changes: 11 additions & 0 deletions Doc/library/stdtypes.rst
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Expand Up @@ -1328,6 +1328,17 @@ Mutable sequence types also support the following methods:
For the most part, this is the same as writing
``seq[len(seq):len(seq)] = iterable``.

.. note::

When extending a sequence with itself (e.g., ``seq.extend(seq)``),
the behavior differs between sequence types if the sequence mutates
during iteration:

* :class:`list` and :class:`array.array` pick up elements as they
are added, potentially leading to unbounded growth.
* :class:`bytearray` captures the sequence length at the start,
limiting the extension to at most doubling the original length.

.. method:: bytearray.insert(index, value, /)
list.insert(index, value, /)
:no-contents-entry:
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