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Please refer detail for:
http://svn.ruby-lang.org/repos/ruby/tags/v1_9_3_0/NEWS
http://svn.ruby-lang.org/repos/ruby/tags/v1_9_3_0/ChangeLog
Short summary from NEWS:
* Ruby's License is changed from a dual license with GPLv2
to a dual license with 2-clause BSDL.
* Encoding
* new encodings: CP950, CP951, UTF-16 and UTF-32
* change alias:
* SJIS is Windows-31J
* Regexps now support Unicode 6.0. (new characters and scripts)
* builtin classes
* ARGF
* new methods: ARGF.read_nonblock and so on.
* Array
* extended method: Array#pack supports endian modifiers
* String
* extended method: String#unpack supports endian modifiers
* new method: String#prepend and String#byteslice
* Bignum
* Multiplication algorithm for Bignums with a large number of digits over
150 BDIGITs is changed in order to reduce its calculation time.
Now such large Bignums are multiplied by using Toom-3 algorithm.
* File
* new constant: File::NULL and File::DIRECT
* IO
* extended method: IO#putc supports multibyte characters
* new methods: * IO#advise, IO.write and IO.binwrite
* Kernel
* move #__id__ to BasicObject
* extended method: Kernel#rand supports range argument
* Module
* new methods: Module#private_constant and Module#public_constant
* Random
* extended method: Random.rand supports range argument
* Time
* extended method: Time#strftime supports %:z and %::z
* Process
* Process#maxgroups and Process#maxgroups= now raise NotImplementedError if
the platform don't support supplementary groups concept
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