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gh-159739: Preserve non-BMP characters in multibyte encoders by jelle-openai · Pull Request #159987 · python/cpython · GitHub

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gh-159739: Preserve non-BMP characters in multibyte encoders - #159987

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JelleZijlstra merged 1 commit into
python:mainfrom
jelle-openai:jelle/codex/gh-159739-multibyte-pair-nonbmp
Oct 21, 2026
Merged

JelleZijlstra merged 1 commit into
python:mainfrom
jelle-openai:jelle/codex/gh-159739-multibyte-pair-nonbmp

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jelle-openai commented Oct 20, 2026 •
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Preserve non-BMP characters in multibyte encoders. Some Big5-HKSCS and JIS X 0213 encoders look up a two-character mapping after narrowing or masking the second code point to 16 bits. A non-BMP character whose low bits match a valid combining character can be silently consumed as that character, changing the text on encode/decode instead of raising UnicodeEncodeError with the default error handler.

Backport to 3.15 and 3.14.

JelleZijlstra added needs backport to 3.14 bugs and security fixes needs backport to 3.15 bugs and security fixes labels Oct 20, 2026
JelleZijlstra enabled auto-merge (squash) October 21, 2026 18:46
JelleZijlstra merged commit 600f99d into python:main Oct 21, 2026
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Thanks @jelle-openai for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14, 3.15.
🐍🍒⛏🤖

bedevere-app Bot commented Oct 21, 2026

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GH-160094 is a backport of this pull request to the 3.15 branch.

bedevere-app Bot removed the needs backport to 3.15 bugs and security fixes label Oct 21, 2026

bedevere-app Bot commented Oct 21, 2026

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GH-160095 is a backport of this pull request to the 3.14 branch.

bedevere-app Bot removed the needs backport to 3.14 bugs and security fixes label Oct 21, 2026
JelleZijlstra pushed a commit that referenced this pull request Oct 22, 2026
…H-159987) (#160094)

(cherry picked from commit 600f99d)

Co-authored-by: Jelle Zijlstra <jelle@openai.com>
JelleZijlstra pushed a commit that referenced this pull request Oct 22, 2026
…H-159987) (#160095)

(cherry picked from commit 600f99d)

Co-authored-by: Jelle Zijlstra <jelle@openai.com>
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