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Incremental GC
Symbol GC
core libraries:
Enumerable#slice_after
Float#next_float, Float#prev_float
File.birthtime, File#birthtime
Support Unicode 7.0 #9092
New methods:
bundled libraries:
Update Psych 2.0.6
Update Rake 10.3.2+ (e47d0239)
Update RDoc 4.2.0.alpha (21b241a)
Update RubyGems 2.4.1+ (713ab65)
Update test-unit 3.0.1 (removed from repository but bundled in tarball)
Update minitest 5.4.1 (removed from repository but bundled in tarball)
Deprecate mathn
C API
Remove deprecated APIs
ÏêϸÐÅÏ¢Çë¿´ NEWS in ruby repository(WIP) :https://github.com/ruby/ruby/blob/v2_2_0_preview1/NEWS
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http://cache.ruby-lang.org/pub/ruby/2.2/ruby-2.2.0-preview1.tar.bz2
http://cache.ruby-lang.org/pub/ruby/2.2/ruby-2.2.0-preview1.tar.gz
http://cache.ruby-lang.org/pub/ruby/2.2/ruby-2.2.0-preview1.tar.xz
http://cache.ruby-lang.org/pub/ruby/2.2/ruby-2.2.0-preview1.zip
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2.2.0 Known issues
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