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1. Commits on Sep 13, 2026

   • gh-156939: Update UTF-8 encoder for PyBytesWriter changes (#157383)

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2. Commits on Aug 14, 2026

   • gh-155742: Get PyBytes_AS_STRING() as `const char*` (#155751)

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3. Commits on Sep 23, 2025

   • gh-129813, PEP 782: Use PyBytesWriter in utf8_encoder() (#138874)

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4. Commits on Jun 27, 2024

   • gh-121040: Use __attribute__((fallthrough)) (#121044)

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5. Commits on Jun 1, 2023

   • gh-92536: Remove PyUnicode_READY() calls (#105210)

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6. Commits on May 2, 2022

   • bpo-36819: Fix crashes in built-in encoders with weird error handlers (GH-28593)

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     serhiy-storchaka

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7. Commits on Mar 31, 2021

   • bpo-43179: Generalise alignment for optimised string routines (GH-24624)

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     jrtc27

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8. Commits on Oct 18, 2020

   • bpo-38252: Use 8-byte step to detect ASCII sequence in 64bit Windows build (GH-16334)

     

     Ma Lin

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9. Commits on Jun 8, 2020

   • bpo-29882: Add _Py_popcount32() function (GH-20518)

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10. Commits on Apr 17, 2020

    • bpo-40302: UTF-32 encoder SWAB4() macro use a|b rather than a+b (GH-19572)

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    • bpo-40302: Add pycore_byteswap.h header file (GH-19552)

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11. Commits on Apr 11, 2020

    • bpo-39943: Add the const qualifier to pointers on non-mutable PyUnicode data. (GH-19345)

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12. Commits on Mar 11, 2020

    • Update some www.unicode.org URLs to use HTTPS. (GH-18912)

      benjaminp

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13. Commits on Feb 27, 2020

    • bpo-39087: Optimize PyUnicode_AsUTF8AndSize() (GH-18327)

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      methane

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14. Commits on Feb 12, 2020

    • closes bpo-39605: Fix some casts to not cast away const. (GH-18453)

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15. Commits on Jun 25, 2019

    • bpo-24214: Fixed the UTF-8 and UTF-16 incremental decoders. (GH-14304)

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      serhiy-storchaka

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16. Commits on May 2, 2019

    • bpo-36775: _PyCoreConfig only uses wchar_t* (GH-13062)

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17. Commits on Aug 29, 2018

    • bpo-34523: Support surrogatepass in locale codecs (GH-8995)

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18. Commits on Aug 21, 2017

    • bpo-30923: Silence fall-through warnings included in -Wextra since gcc-7.0. (#3157)

      

      Stefan Krah

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19. Commits on Oct 30, 2016

    • Issue #28561: Clean up UTF-8 encoder: remove dead code, update comments, etc.

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20. Commits on Sep 2, 2016

    • PEP 7 style for if/else in C

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21. Commits on Aug 30, 2016

    • Issue #27895: Spelling fixes (Contributed by Ville Skyttä).

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22. Commits on May 16, 2016

    • Issue #26765: Ensure that bytes- and unicode-specific stringlib files are used

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      serhiy-storchaka

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23. Commits on Oct 9, 2015

    • Optimize error handlers of ASCII and Latin1 encoders when the replacement

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    • Add _PyBytesWriter_WriteBytes() to factorize the code

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    • _PyBytesWriter: simplify code to avoid "prealloc" parameters

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24. Commits on Oct 8, 2015

    • Optimize backslashreplace error handler

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    • Issue #25318: Add _PyBytesWriter API

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25. Commits on Oct 1, 2015

    • Issue #25267: The UTF-8 encoder is now up to 75 times as fast for error

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26. Commits on May 18, 2015

    • Fixed typos in comments.

      serhiy-storchaka

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    • Fixed typos in comments.

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27. Commits on May 12, 2015

    • Issue #15027: The UTF-32 encoder is now 3x to 7x faster.

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28. Commits on Jan 4, 2014

    • Reverted changeset b72c5573c5e7 (issue #15027).

      serhiy-storchaka

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    • Issue #15027: Rewrite the UTF-32 encoder. It is now 1.6x to 3.5x faster.

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29. Commits on Nov 19, 2013

    • Remove dead code committed in issue #12892.

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