News

3.2.0 - 2025-12-17

Improvements

• Improved documents.

  • GH-179

  • GH-188

  • GH-189

  • GH-190

  • GH-191

  • GH-192

  • GH-193

  • GH-194

  • Patch by Burdette Lamar

Thanks

• Burdette Lamar

3.1.9 - 2025-12-01

Improvements

• [DOC] Tweaks for StringIO#each_line

  • GH-165

  • GH-165

• [DOC] Doc for StringIO.size

  • GH-175

• [DOC] Tweaks for StringIO#fsync

  • GH-173

• [DOC] Fix seek link

  • GH-174

• Add a note about chilled string support to 3.1.8 release note

  • GH-180 fixes GH-179

Fixes

• JRuby: Removed use of RubyBasicObject.flags

  • GH-182

Thanks

• Burdette Lamar

• Charles Oliver Nutter

3.1.8 - 2025-11-12

Improvements

• Improved documents

  • Patch by Burdette Lamar

  • Patch by Burdette Lamar

• Improved chilled string support

  • GH-128

Fixes

• Fixed SEGV in StringIO#seek with SEEK_END on StringIO.new(nil)

  • GH-137

  • Patch by koh-sh

  • GH-137

  • Patch by koh-sh

• Fixed SEGV in StringIO#read on StringIO.new(nil)

• Fixed SEGV in StringIO#pread on StringIO.new(nil)

• Fixed SEGV in StringIO#eof? on StringIO.new(nil)

• JRuby: Fixed a bug that StringIO#read doesn’t clear code range

  • GH-156

  • Patch by Karol Bucek

Thanks

• koh-sh

• Burdette Lamar

• Karol Bucek

3.1.7 - 2025-04-21

Improvements

• CRuby: Added support for rb_io_mode_t that will be introduced in Ruby 3.5 or later.

  • GH-129

  • Patch by Samuel Williams

Thanks

• Samuel Williams

3.1.6 - 2025-03-25

Fixes

• CRuby: Fix SEGV at unget to a null device StringIO

• JRuby:

  • Fix NullPointerException at unget to a null device StringIO

  • Use proper checkEncoding signature

  • Update strioWrite logic to match CRuby

  • GH-124

3.1.5 - 2025-02-21

Improvements

• JRuby: Improved compatibility with CRuby for StringIO#seek with frozen string.

  • GH-119

  • GH-121

3.1.4 - 2025-02-20

Improvements

• JRuby: Improved compatibility with CRuby.

  • GH-116

Fixes

• CRuby: Fixed a bug that StringIO may mutate a shared string.

  • GH-117

3.1.3 - 2025-02-14

Fixes

• JRuby: Fixed a bug that JRuby may not be able to be started

  • GH-112

  • GH-113

  • Reported by Karol Bucek

Thanks

• Karol Bucek

3.1.2 - 2024-11-07

Improvements

• JRuby: Added support for detecting encoding by BOM.

  • GH-100

  • GH-101

Fixes

• CRuby: Fixed a bug that unknown memory may be used by StringIO#ungetc/StringIO#ungetbyte.

  • hackerone.com/reports/2805165

  • Reported by manun.

Thanks

• manun

3.1.1 - 2024-06-13

Improvements

• JRuby: Improved.

  • GH-83

  • GH-84

  • GH-85

  • GH-83

  • GH-84

  • GH-85

• Added StringIO::MAX_LENGTH.

• Added support for NULL StringIO by StringIO.new(nil).

• Improved IO compatibility for partial read.

  • GH-95

  • bugs.ruby-lang.org/issues/20418

Fixes

• Fixed a bug that coderange isn’t updated after overwrite.

  • Reported by Tiago Cardoso.

  • bugs.ruby-lang.org/issues/20185

  • GH-77

  • GH-79

Thanks

• Tiago Cardoso

3.1.0 - 2023-11-28

Fixes

• TruffleRuby: Do not compile the C extension

  GH-71

3.0.9 - 2023-11-08

Improvements

• JRuby: Aligned StringIO#gets behavior with the C implementation.

  GH-61

Fixes

• CRuby: Fixed StringIO#pread with the length 0.

  Patch by Jean byroot Boussier.

  GH-67

• CRuby: Fixed a bug that StringIO#gets with non ASCII compatible encoding such as UTF-16 doesn’t detect correct new line characters.

  Reported by IWAMOTO Kouichi.

  GH-68

Thanks

• Jean byroot Boussier

• IWAMOTO Kouichi

3.0.8 - 2023-08-10

Improvements

• Added StringIO#pread.

  Patch by Jean byroot Boussier.

  GH-56

• JRuby: Added StringIO::VERSION.

  GH-57 GH-59

Thanks

• Jean byroot Boussier

3.0.7 - 2023-06-02

• CRuby: Avoid direct struct usage. This change is for supporting Ruby 3.3.

  GH-54

3.0.6 - 2023-04-14

Improvements

• CRuby: Added support for write barrier.

• JRuby: Added missing arty-checking.

  GH-48

• JRuby: Added support for StringIO.new(encoding:).

  GH-45

3.0.5 - 2023-02-02

Improvements

Fixes

• Fixed a bug that StringIO#gets("2+ character", chomp: true) did not remove the separator at the end. [Bug #19389]

3.0.4 - 2022-12-09

Improvements

• JRuby: Changed to use flag registry. [GitHub#33]

3.0.3 - 2022-12-08

Improvements

• Improved documents. [GitHub#33] [GitHub#34] [GitHub#35] [GitHub#36] [GitHub#37] [Patch by Burdette Lamar]

Fixes

• Fixed a bug that large StringIO#ungetc/StringIO#ungetbyte break internal buffer.

• Fixed a bug that StringIO#each("2+ character", chomp: true) cause infinite loop. [Bug #18769]

• Fixed a bug that StringIO#each(nil, chomp: true) chomps. [Bug #18770]

• Fixed a bug that StringIO#each("", chomp: true) isn’t compatible with IO#each("", chomp: true). [Bug #18768]

• Fixed a bug that StringIO#set_encoding doesn’t accept external and internal encodings pairo. [GitHub#16] [Reported by Kenta Murata]

• Fixed a bug that StringIO#truncate isn’t compatible with File#truncate.

Thanks

• Kenta Murata

• Burdette Lamar