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+---
+layout: news_post
+title: "Ruby 2.4.0-preview2 Released"
+author: "naruse"
+translator:
+date: 2016-09-08 18:00:00 +0900
+lang: en
+---
+
+We are pleased to announce the release of Ruby 2.4.0-preview2.
+
+Ruby 2.4.0-preview2 is the second preview of Ruby 2.4.0.
+This preview2 is released to get feedback from the community.
+Feel free to
+[send feedback](https://bugs.ruby-lang.org/projects/ruby/wiki/HowToReport)
+since you can still influence the features.
+
+## [Unify Fixnum and Bignum into Integer](https://bugs.ruby-lang.org/issues/12005)
+
+Though [ISO/IEC 30170:2012](http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=59579)
+doesn't specify details of the Integer class,
+Ruby had two visible Integer classes: Fixnum and Bignum.
+Ruby 2.4 unifies them into Integer.
+All C extensions which touches Fixnum or Bignum class needs to be fixed.
+
+See also [the ticket](https://bugs.ruby-lang.org/issues/12005) and [akr's slides](http://www.a-k-r.org/pub/2016-09-08-rubykaigi-unified-integer.pdf).
+
+## [String supports Unicode case mappings](https://bugs.ruby-lang.org/issues/10085)
+
+`String/Symbol#upcase/downcase/swapcase/capitalize(!)` now handle
+Unicode case mappings instead of only ASCII case mappings.
+
+## Performance improvements
+
+Ruby 2.4 also contains the following performance improvements including
+language changes:
+
+### [Array#max, Array#min](https://bugs.ruby-lang.org/issues/12172)
+
+`[x, y].max` and `[x, y].min` are optimized to not create a temporary array
+under certain conditions.
+
+### [Regexp#match?](https://bugs.ruby-lang.org/issues/8110)
+
+Added `Regexp#match?`, which executes a regexp match without creating
+a back reference object and changing `$~` to reduce object allocation.
+
+### Other performance improvements
+
+* [speed up instance variable access](https://bugs.ruby-lang.org/issues/12274)
+
+## Debugging
+
+### [Thread#report_on_exception and Thread.report_on_exception](https://bugs.ruby-lang.org/issues/6647)
+
+Ruby ignores exceptions in threads unless another thread explicitly joins them.
+With `report_on_exception = true`,
+you can notice if a thread has died due to an unhandled exception.
+
+Send us feedback what should be the default for `report_on_exception`
+and about report-on-GC, which show a report when a thread is GCed without join.
+
+### [Thread deadlock detection now shows threads with their backtrace and dependency](https://bugs.ruby-lang.org/issues/8214)
+
+Ruby has deadlock detection around waiting threads, but its report doesn't
+include enough information for debugging.
+Ruby 2.4's deadlock detection shows threads with their backtrace and
+dependent threads.
+
+Try and enjoy programming with Ruby 2.4.0-preview2, and
+[send us feedback](https://bugs.ruby-lang.org/projects/ruby/wiki/HowToReport)!
+
+## Notable Changes since 2.3
+
+* Support OpenSSL 1.1.0
+* ext/tk is now removed from stdlib [Feature #8539]
+
+See [NEWS](https://github.com/ruby/ruby/blob/v2_4_0_preview2/NEWS)
+and [ChangeLog](https://github.com/ruby/ruby/blob/v2_4_0_preview2/ChangeLog)
+for details.
+
+With those changes,
+[2353 files changed, 289057 insertions(+), 73847 deletions(-)](https://github.com/ruby/ruby/compare/v2_3_0...v2_4_0_preview2)
+since Ruby 2.3.0!
+
+## Download
+
+* <https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0-preview2.tar.bz2>
+
+  * SIZE:   12463225 bytes
+  * SHA1:   95a501624f1cf4bb0785d3e17afd0ad099f66385
+  * SHA256: 2224c55b2d87b5c0f08d23a4618e870027dbc1cffbfb4a05efd19eac4ff4cf1d
+  * SHA512: 0c9a59a2f57a99c4ee8539a30f41da1de7547566203f89d856e1be9dbb44365754e6c470145dc9336eb324e0feb2f53d9fef18a1564968ac21f9ee528905949f
+
+* <https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0-preview2.tar.gz>
+
+  * SIZE:   15586514 bytes
+  * SHA1:   492a13c4ddc1c0c218433acb00dcf7ddeef96fe0
+  * SHA256: fec544836428aada2dc593a8cc42ce330798a805e49ecb807a0e21b386fd0b14
+  * SHA512: 5a3de852a7611e79f38219ed7bb13772aaabb25538ca843d38743180a0cc939a4e34c008b61d578da785285196b6b8882270bddc17cbed481237db8afa4c54e4
+
+* <https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0-preview2.tar.xz>
+
+  * SIZE:   9886832 bytes
+  * SHA1:   95d5fd7d54d86497194f69ec433755a517dcde8f
+  * SHA256: 6c2d25bedc50c2f19b0e349f0ffd9b9a83000d9cb6a677bf5372fb493d33e16a
+  * SHA512: b9bd898d17583103ee61b4764ac86eb62c9661fca1f41ff0d06a15965a0a1ba581491d4b8a342e527d63e102b6ddcb2acebdabe5b246409ce9711e13f9428d5b
+
+* <https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0-preview2.zip>
+
+  * SIZE:   17401564 bytes
+  * SHA1:   5f3a5b2fd03f70d49e74ec36be3e0c110f6c17cc
+  * SHA256: 4d0e466148283ad52208b1e1b70b018aefb7fa95b490fc862d5ea4ca284ecdd2
+  * SHA512: 0ef2098d995238580245a4bcee843641199c1194189be13614611e2ffec329278072319a799d409eaf13b1cff45f05a0eae02d9ea8ccc69058fa49e03eca0130
+
+## Release Comment
+
+See also the release schedule and other information:
+
+[ReleaseEngineering24](https://bugs.ruby-lang.org/projects/ruby-trunk/wiki/ReleaseEngineering24)