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en/news/_posts/2016-09-08-ruby-2-4-0-preview2-released.md
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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 | ||
| --- | ||
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| We are pleased to announce the release of Ruby 2.4.0-preview2. | ||
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| 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. | ||
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| ## [Unify Fixnum and Bignum into Integer](https://bugs.ruby-lang.org/issues/12005) | ||
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| 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. | ||
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| 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). | ||
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| ## [String supports Unicode case mappings](https://bugs.ruby-lang.org/issues/10085) | ||
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| `String/Symbol#upcase/downcase/swapcase/capitalize(!)` now handle | ||
| Unicode case mappings instead of only ASCII case mappings. | ||
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| ## Performance improvements | ||
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| Ruby 2.4 also contains the following performance improvements including | ||
| language changes: | ||
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| ### [Array#max, Array#min](https://bugs.ruby-lang.org/issues/12172) | ||
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| `[x, y].max` and `[x, y].min` are optimized to not create a temporary array | ||
| under certain conditions. | ||
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| ### [Regexp#match?](https://bugs.ruby-lang.org/issues/8110) | ||
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| Added `Regexp#match?`, which executes a regexp match without creating | ||
| a back reference object and changing `$~` to reduce object allocation. | ||
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| ### Other performance improvements | ||
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| * [speed up instance variable access](https://bugs.ruby-lang.org/issues/12274) | ||
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| ## Debugging | ||
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| ### [Thread#report_on_exception and Thread.report_on_exception](https://bugs.ruby-lang.org/issues/6647) | ||
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| 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. | ||
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| 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. | ||
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| ### [Thread deadlock detection now shows threads with their backtrace and dependency](https://bugs.ruby-lang.org/issues/8214) | ||
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| 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. | ||
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| Try and enjoy programming with Ruby 2.4.0-preview2, and | ||
| [send us feedback](https://bugs.ruby-lang.org/projects/ruby/wiki/HowToReport)! | ||
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| ## Notable Changes since 2.3 | ||
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| * Support OpenSSL 1.1.0 | ||
| * ext/tk is now removed from stdlib [Feature #8539] | ||
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| 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. | ||
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| 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! | ||
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| ## Download | ||
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| * <https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0-preview2.tar.bz2> | ||
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| * SIZE: 12463225 bytes | ||
| * SHA1: 95a501624f1cf4bb0785d3e17afd0ad099f66385 | ||
| * SHA256: 2224c55b2d87b5c0f08d23a4618e870027dbc1cffbfb4a05efd19eac4ff4cf1d | ||
| * SHA512: 0c9a59a2f57a99c4ee8539a30f41da1de7547566203f89d856e1be9dbb44365754e6c470145dc9336eb324e0feb2f53d9fef18a1564968ac21f9ee528905949f | ||
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| * <https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0-preview2.tar.gz> | ||
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| * SIZE: 15586514 bytes | ||
| * SHA1: 492a13c4ddc1c0c218433acb00dcf7ddeef96fe0 | ||
| * SHA256: fec544836428aada2dc593a8cc42ce330798a805e49ecb807a0e21b386fd0b14 | ||
| * SHA512: 5a3de852a7611e79f38219ed7bb13772aaabb25538ca843d38743180a0cc939a4e34c008b61d578da785285196b6b8882270bddc17cbed481237db8afa4c54e4 | ||
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| * <https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0-preview2.tar.xz> | ||
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| * SIZE: 9886832 bytes | ||
| * SHA1: 95d5fd7d54d86497194f69ec433755a517dcde8f | ||
| * SHA256: 6c2d25bedc50c2f19b0e349f0ffd9b9a83000d9cb6a677bf5372fb493d33e16a | ||
| * SHA512: b9bd898d17583103ee61b4764ac86eb62c9661fca1f41ff0d06a15965a0a1ba581491d4b8a342e527d63e102b6ddcb2acebdabe5b246409ce9711e13f9428d5b | ||
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| * <https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0-preview2.zip> | ||
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| * SIZE: 17401564 bytes | ||
| * SHA1: 5f3a5b2fd03f70d49e74ec36be3e0c110f6c17cc | ||
| * SHA256: 4d0e466148283ad52208b1e1b70b018aefb7fa95b490fc862d5ea4ca284ecdd2 | ||
| * SHA512: 0ef2098d995238580245a4bcee843641199c1194189be13614611e2ffec329278072319a799d409eaf13b1cff45f05a0eae02d9ea8ccc69058fa49e03eca0130 | ||
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| ## Release Comment | ||
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| See also the release schedule and other information: | ||
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| [ReleaseEngineering24](https://bugs.ruby-lang.org/projects/ruby-trunk/wiki/ReleaseEngineering24) | ||
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will the above mentioned changes be also included, at least for the final release post?
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Yes, because OpenSSL 1.1.0 is drastically incompatible with 1.x API.
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Sorry, I meant will the changes that were already explained above (like Integer, ...) also appear on this list?
If not, the section title should be "Other Notable Changes".
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Ah, it should be "Other Notable Changes".
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Fixed with 53f1a0b.
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thanks!