Ruby Issue Tracking System

06/05/2026

03:33 AM Ruby Revision b7aa15f5 (git): Improve performance of `String#inspect` with an ASCII bulk-skip fast path

Bulk-skip ASCII bytes that need no escaping via a 256-byte lookup
table, avoiding per-byte `rb_enc_precise_mbclen` and `rb_enc_mbc_to_codepoint`
calls. Eligible for well-formed strings (CR=7BIT, or UTF-8 VALID);
other strings fall throug... ima1zumi (Mari Imaizumi)

04/14/2026

03:47 AM Ruby Misc #21975 (Rejected): Add "UTF-八" as an alias for UTF-8 encoding

While I appreciate the proposal, I must reject it for two reasons:
First, on consistency: the vertical writing is allowed only inside string arguments, while the rest of Ruby code remains horizontal. This is inconsistent.
Second, o... ima1zumi (Mari Imaizumi)

11/14/2025

03:27 AM Ruby Feature #21275 (Closed): Update to Unicode 17.0

Applied in changeset commit:git|cb3bc8ae3f02882debd5f56ee6ef8f99f0addda0.
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[Feature #21275] Bump Unicode version to 17.0.0 ima1zumi (Mari Imaizumi)

03:27 AM Ruby Revision cb3bc8ae (git): [Feature #21275] Bump Unicode version to 17.0.0

ima1zumi (Mari Imaizumi)

03:27 AM Ruby Revision 47e3aff9 (git): Adapt to Unicode directory changes

https://www.unicode.org/Public/emoji/ReadMe.txt
> This directory contains data files for versions 1.0 to 16.0 of Unicode Emoji.
> ...
> https://www.unicode.org/Public/<version>/ucd/emoji/ ima1zumi (Mari Imaizumi)

09/01/2025

11:50 PM Ruby Bug #21559: Unicode normalization nfd -> nfc -> nfd is not reversible

@duerst Thank you, I appreciate you taking care of it. ima1zumi (Mari Imaizumi)

12:50 AM Ruby Bug #21559: Unicode normalization nfd -> nfc -> nfd is not reversible

This looks like a bug. Per Unicode TR15, the identity toNFD(x) == toNFD(toNFC(x)) must be maintained. https://unicode.org/reports/tr15/#Design_Goals
It seems the NFC process is combining characters across U+11930, even though its CCC is... ima1zumi (Mari Imaizumi)

08/31/2025

11:17 PM Ruby Revision ed0ffcdc (git): Remove unnecessary Enumerable#each_slice

This method has been a built-in feature since Ruby 1.8.7, so this
fallback implementation is no longer needed.
Ref: https://docs.ruby-lang.org/en/3.4/NEWS/NEWS-1_8_7.html ima1zumi (Mari Imaizumi)

04/18/2025

10:50 AM Ruby Feature #20724 (Closed): Update to Unicode 16.0

Applied in changeset commit:git|63b07cdcbba1d523219c8a59048615441d0a9c08.
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[Feature #20724] Bump Unicode version to 16.0.0 ima1zumi (Mari Imaizumi)

10:50 AM Ruby Revision ccc74933 (git): U+036F is now alnum

0363..036F ; Alphabetic # Mn [13] COMBINING LATIN SMALL LETTER A..COMBINING LATIN SMALL LETTER X ima1zumi (Mari Imaizumi)