Move from NEWS to doc/NEWS-2.4.0

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-# -*- rdoc -*-
-
-= NEWS for Ruby 2.4.0
-
-This document is a list of user visible feature changes made between
-releases except for bug fixes.
-
-Note that each entry is kept so brief that no reason behind or
-reference information is supplied with.  For a full list of changes
-with all sufficient information, see the ChangeLog file or Redmine
-(e.g. <tt>https://bugs.ruby-lang.org/issues/$FEATURE_OR_BUG_NUMBER</tt>)
-
-== Changes since the 2.3.0 release
-
-=== Language changes
-
-* Multiple assignment in conditional expression is now allowed.
-  [Feature #10617]
-
-* Refinements is enabled at method by Symbol#to_proc.  [Feature #9451]
-
-* Refinements is enabled with Kernel#send and BasicObject#__send__.
-  [Feature #11476]
-
-* Rescue modifier now applicable to method arguments.
-  [Feature #12686]
-
-* Toplevel return is now allowed.  [Feature #4840]
-
-=== Core classes updates (outstanding ones only)
-
-* Array
-
-  * Array#concat [Feature #12333]
-    Now takes multiple arguments.
-
-  * Array#max and Array#min.  [Feature #12172]
-    This may cause a tiny incompatibility: if you redefine
-    Enumerable#max and call max to an Array, your redefinition will be
-    now ignored.  You should also redefine Array#max.
-
-  * Array#pack [Feature #12754]
-    Now takes optional argument `buffer:' to reuse already allocated buffer.
-
-  * Array#sum  [Feature #12217]
-    This is different from Enumerable#sum in that Array#sum doesn't depend on
-    the definition of each method.
-
-* Comparable
-
-  * Comparable#clamp.  [Feature #10594]
-
-* Dir
-
-  * Dir.empty?.  [Feature #10121]
-
-* Enumerable
-
-  * Enumerable#chunk called without a block now return an Enumerator
-    [Feature #2172]
-  * Enumerable#sum  [Feature #12217]
-  * Enumerable#uniq  [Feature #11090]
-
-* Enumerator::Lazy
-
-  * Enumerator::Lazy#chunk_while  [GH-1186]
-  * Enumerator::Lazy#uniq  [Feature #11090]
-
-* File
-
-  * File.empty?.  [Feature #9969]
-
-* Float
-
-  * Float#ceil, Float#floor, and Float#truncate now take an optional
-    digits, as well as Float#round.  [Feature #12245]
-
-  * Float#round now takes an optional keyword argument, half option, and
-    the default behavior is round-up.  [Bug #12548] [Bug #12958]
-    half option can be one of :even, :up, and :down.  [Feature #12953]
-
-* Hash
-
-  * Hash#compact and Hash#compact!  [Feature #11818]
-  * Hash#transform_values and Hash#transform_values!  [Feature #12512]
-
-* Integer
-
-  * Fixnum and Bignum are unified into Integer  [Feature #12005]
-
-  * Integer#ceil, Integer#floor, and Integer#truncate now take an optional
-    digits, as well as Integer#round.  [Feature #12245]
-
-  * Integer#digits for extracting columns of place-value notation [Feature #12447]
-
-  * Integer#round now takes an optional keyword argument, half option, and the
-    default behavior is round-up now.  [Bug #12548] [Bug #12958]
-    half option can be one of :even, :up, and :down.  [Feature #12953]
-
-* IO
-
-  * IO#gets, IO#readline, IO#each_line, IO#readlines, IO.foreach now takes
-    an optional keyword argument, chomp flag.  [Feature #12553]
-
-* Kernel
-
-  * Kernel#clone now takes an optional keyword argument, freeze flag.
-    [Feature #12300]
-
-* MatchData
-
-  * MatchData#named_captures [Feature #11999]
-  * MatchData#values_at supports named captures [Feature #9179]
-
-* Module
-
-  * Module#refine accepts a module as the argument now. [Feature #12534]
-  * Module.used_modules [Feature #7418]
-
-* Numeric
-
-  * Numeric#finite?, Numeric#infinite? [Feature #12039]
-
-* Process
-
-  * Support CLOCK_MONOTONIC_RAW_APPROX, CLOCK_UPTIME_RAW, and
-    CLOCK_UPTIME_RAW_APPROX which are introduced by macOS 10.12.
-
-* Rational
-
-  * Rational#round now takes an optional keyword argument, half option, and
-    the default behavior is round-up now.  [Bug #12548] [Bug #12958]
-    half option can be one of :even, :up, and :down.  [Feature #12953]
-
-* Regexp
-
-  * meta character \X matches Unicode 9.0 characters with some workarounds
-    for UTR #51 Unicode Emoji, Version 4.0 emoji zwj sequences.
-
-  * Regexp#match? [Feature #8110]
-    This returns bool and doesn't save backref.
-
-  * Update Onigmo 6.0.0.
-
-* Regexp/String: Updated Unicode version from 8.0.0 to 9.0.0 [Feature #12513]
-
-* RubyVM::Env
-
-  * RubyVM::Env was removed.
-
-* String
-
-  * String#casecmp? [Feature #12786]
-
-  * String#concat, String#prepend [Feature #12333]
-    Now takes multiple arguments.
-
-  * String#each_line, String#lines now takes an optional keyword argument,
-    chomp flag.  [Feature #12553]
-
-  * String#match? [Feature #12898]
-
-  * String#unpack1 [Feature #12752]
-
-  * String#upcase, String#downcase, String#capitalize, String#swapcase and
-    their bang variants work for all of Unicode, and are no longer limited
-    to ASCII. Supported encodings are UTF-8, UTF-16BE/LE, UTF-32BE/LE, and
-    ISO-8859-1~16. Variations are available with options. See the documentation
-    of String#downcase for details. [Feature #10085]
-
-  * String.new(capacity: size) [Feature #12024]
-
-* StringIO
-
-  * StringIO#gets, StringIO#readline, StringIO#each_line, StringIO#readlines now takes
-    an optional keyword argument, chomp flag.  [Feature #12553]
-
-* Symbol
-
-  * Symbol#casecmp? [Feature #12786]
-
-  * Symbol#match now returns MatchData.  [Bug #11991]
-
-  * Symbol#match? [Feature #12898]
-
-  * Symbol#upcase, Symbol#downcase, Symbol#capitalize, and Symbol#swapcase now
-    work for all of Unicode. See the documentation of String#downcase
-    for details. [Feature #10085]
-
-* Thread
-
-  * Thread#report_on_exception and Thread.report_on_exception
-    [Feature #6647]
-
-* TracePoint
-
-  * TracePoint#callee_id [Feature #12747]
-
-* Warning
-
-  * New module named Warning is introduced.  By default it has only
-    one singleton method, named warn.  This makes it possible for
-    3rd-party libraries to control the way warnings are handled.
-    [Feature #12299]
-
-=== Stdlib updates (outstanding ones only)
-
-* CGI
-
-  * Don't allow , as a separator [Bug #12791]
-
-* CSV
-
-  * Add a liberal_parsing option. [Feature #11839]
-
-* IPAddr
-
-  * IPAddr#== and IPAddr#<=> no longer raise an exception if coercion fails.
-    [Bug #12799]
-
-* IRB
-
-  * Binding#irb: Start a REPL session like `binding.pry` at r56624.
-
-* Logger
-
-  * Allow specifying logger parameters in constructor such
-    as level, progname, datetime_format, formatter. [Feature #12224]
-  * Add shift_period_suffix option. [Feature #10772]
-
-* Net::HTTP
-
-  * New method: Net::HTTP.post [Feature #12375]
-
-* Net::FTP
-
-  * Support TLS (RFC 4217).
-  * Support hash style options for Net::FTP.new.
-  * Add a new optional argument pathname to Net::FTP#status.
-    Contributed by soleboxy. [GH-1478] [Feature #12965]
-
-* OpenSSL
-
-  * Includes Ruby/OpenSSL 2.0. OpenSSL has been extracted as a Gem and is
-    maintained at a separate repository now: https://github.com/ruby/openssl.
-    It still remains as a 'default gem'.  [Feature #9612]
-    Refer to ext/openssl/History.md for the full release note.
-
-* optparse
-
-  * Add an into option. [Feature #11191]
-
-* pathname
-
-  * New method: Pathname#empty? [Feature #12596]
-
-* Readline
-
-  * Readline.quoting_detection_proc and Readline.quoting_detection_proc=
-    [Feature #12659]
-
-* REXML
-
-  * REXML::Element#[]: If String or Symbol is specified, attribute
-    value is returned. Otherwise, Nth child is returned. This is
-    backward compatible change.
-
-* set
-
-  * New methods: Set#compare_by_identity and Set#compare_by_identity?.
-    [Feature #12210]
-
-* WEBrick
-
-  * Don't allow , as a separator [Bug #12791]
-
-=== Compatibility issues (excluding feature bug fixes)
-
-* Array#sum and Enumerable#sum are implemented.  [Feature #12217]
-  Ruby itself has no compatibility problem because Ruby didn't have sum method
-  for arrays before Ruby 2.4.
-  However many third party gems, activesupport, facets, simple_stats, etc,
-  defines sum method.  These implementations are mostly compatible but
-  there are subtle differences.
-  Ruby's sum method should be mostly compatible but it is impossible to
-  be perfectly compatible with all of them.
-
-* Fixnum and Bignum are unified into Integer  [Feature #12005]
-  Fixnum class and Bignum class is removed.
-  Integer class is changed from abstract class to concrete class.
-  For example, 0 is an instance of Integer: 0.class returns Integer.
-  The constants Fixnum and Bignum is bound to Integer.
-  So obj.kind_of?(Fixnum) works as obj.kind_of?(Integer).
-  At C-level, Fixnum object and Bignum object should be distinguished by
-  FIXNUM_P(obj) and RB_TYPE_P(obj, T_BIGNUM).
-  RUBY_INTEGER_UNIFICATION can be used to detect this feature at C-level.
-  0.class == Integer can be used to detect this feature at Ruby-level.
-  The C-level constants, rb_cFixnum and rb_cBignum, are removed.
-  They can cause compilation failure.
-
-* String/Symbol#upcase/downcase/swapcase/capitalize(!) now work for all of
-  Unicode, not only for ASCII. [Feature #10085]
-  No change is needed if the data is in ASCII anyway or if the limitation
-  to ASCII was only tolerated while waiting for a more extensive implementation.
-  A change (using the :ascii option) is needed in cases where Unicode data
-  is processed, but the operation has to be limited to ASCII only.
-  A good example of this are internationalized domain names.
-
-* TRUE / FALSE / NIL
-  These constants are now obsoleted. [Feature #12574]
-  Use true / false / nil resp. instead.
-
-=== Stdlib compatibility issues (excluding feature bug fixes)
-
-* DateTime
-
-  * DateTime#to_time now preserves timezone.  [Bug #12189]
-
-* PSych
-
-  * Update Psych 2.2.2
-
-* RDoc
-
-  * Update RDoc 5.0.0
-
-* RubyGems
-
-  * Update RubyGems 2.6.8
-
-* shellwords
-
-  * Shellwords.shellwords (shellsplit) treats the backslash as escape
-    character only when followed by one of the following characters:
-    $ ` " \ <newline>
-    [Bug #10055]
-
-* Time
-
-  * Time#to_time now preserves timezone.  [Bug #12271]
-
-* thread
-
-  * the extension library is removed.  Till 2.0 it was a pure ruby script
-    "thread.rb", which has precedence over "thread.so", and has been provided
-    in $LOADED_FEATURES since 2.1.
-
-* Tk
-
-  * Tk is removed from stdlib.  [Feature #8539]
-    https://github.com/ruby/tk is the new upstream.
-
-* XMLRPC
-
-  * XMLRPC is removed from stdlib, and bundled as gem. [Feature #12160][ruby-core:74239]
-    https://github.com/ruby/xmlrpc is the new upstream.
-
-* Zlib
-
-  * Zlib.gzip and Zlib.gunzip [Feature #13020]
-
-=== C API updates
-
-* ruby_show_version() will no longer exits the process, if
-  RUBY_SHOW_COPYRIGHT_TO_DIE is set to 0.  This will be the default in
-  the future.
-
-* rb_gc_adjust_memory_usage() [Feature #12690]
-
-=== Supported platform changes
-
-* FreeBSD < 4 is no longer supported
-
-=== Implementation improvements
-
-* In some condition, `[x, y].max` and `[x, y].min` are optimized
-  so that a temporal array is not created.  The concrete condition is
-  an implementation detail: currently, the array literal must have no
-  splat, must have at least one expression but literal, the length must
-  be <= 0x100, and Array#max and min must not be redefined.  It will work
-  in most casual and real-life use case where it is written with intent
-  to `Math.max(x, y)`.
-
-* Thread deadlock detection now shows their backtrace and dependency. [Feature #8214]
-
-* st_table (st.c) internal data structure is improved. [Feature #12142]
-
-* Rational is extensively optimized. [Feature #12484]
-
-=== Miscellaneous changes
-
-* ChangeLog is removed from the repository.
-  It is generated from commit messages in Subversion by `make dist`.
-  Also note that now people should follow Git style commit message.
-  The template is written at
-  [Short (50 chars or less) summary of changes](https://git-scm.com/book/ch5-2.html).
-  [Feature #12283]