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<h1 id="label-NEWS+for+Ruby+2.6.0">NEWS for Ruby 2.6.0</h1>
<p>This document is a list of user visible feature changes made between releases except for bug fixes.</p>
<p>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. <code>https://bugs.ruby-lang.org/issues/$FEATURE_OR_BUG_NUMBER</code>)</p>
<h2 id="label-Changes+since+the+2.5.0+release">Changes since the 2.5.0 release</h2>
<h3 id="label-Language+changes">Language changes</h3>
<ul><li>
<p><code>$SAFE</code> now is a process global state and can be set to 0 again. [Feature #14250]</p>
</li><li>
<p>Refinements take place at block passing. [Feature #14223]</p>
</li><li>
<p>Refinements take place at Kernel#public_send. [Feature #15326]</p>
</li><li>
<p>Refinements take place at Kernel#respond_to?. [Feature #15327]</p>
</li><li>
<p><code>else</code> without <code>rescue</code> now causes a syntax error. [EXPERIMENTAL] [Feature #14606]</p>
</li><li>
<p>Constant names may start with a non-ASCII capital letter. [Feature #13770]</p>
</li><li>
<p>Endless ranges are introduced. You can use a Range that has no end, like <code>(0..)</code> (or similarly <code>(0...)</code>). [Feature #12912]</p>
<p>The following shows typical use cases:</p>
<pre class="code ruby"><code class="ruby"><span class='id identifier rubyid_ary'>ary</span>[<span class='int'>1</span><span class='op'>..</span>] <span class='comment'># identical to ary[1..-1]
</span>(<span class='int'>1</span><span class='op'>...</span>).<span class='id identifier rubyid_each'>each</span> {<span class='op'>|</span><span class='id identifier rubyid_index'>index</span><span class='op'>|</span> <span class='id identifier rubyid_block'>block</span> } <span class='comment'># infinite loop from index 1
</span><span class='id identifier rubyid_ary'>ary</span>.<span class='id identifier rubyid_zip'>zip</span>(<span class='int'>1</span><span class='op'>..</span>) {<span class='op'>|</span><span class='id identifier rubyid_elem'>elem</span><span class='comma'>,</span> <span class='id identifier rubyid_index'>index</span><span class='op'>|</span> <span class='id identifier rubyid_block'>block</span> } <span class='comment'># ary.each.with_index(1) { }</span></code></pre>
</li><li>
<p>The “shadowing outer local variable” warning is removed. [Feature #12490]</p>
<p>You can now write the following without warning:</p>
<pre class="code ruby"><code class="ruby"><span class='id identifier rubyid_user'>user</span> <span class='op'>=</span> <span class='id identifier rubyid_users'>users</span>.<span class='id identifier rubyid_find'>find</span> {<span class='op'>|</span><span class='id identifier rubyid_user'>user</span><span class='op'>|</span> <span class='id identifier rubyid_cond'>cond</span>(<span class='id identifier rubyid_user'>user</span>) }</code></pre>
</li><li>
<p>Print <code>cause</code> of the exception if the exception is not caught and printed its backtraces and error message. [Feature #8257]</p>
</li><li>
<p>The flip-flop syntax is deprecated. [Feature #5400]</p>
</li><li>
<p>Non-Symbol keys in a keyword arguments hash was prohibited at 2.6.0, but now allowed again. [Bug #15658]</p>
</li></ul>
<h3 id="label-Core+classes+updates+-28outstanding+ones+only-29">Core classes updates (outstanding ones only)</h3>
<dl class="rdoc-list label-list"><dt>Array
<dd><dl class="rdoc-list label-list"><dt>New methods
<dd><ul><li>
<p>Added Array#union and Array#difference instance methods. [Feature #14097]</p>
</li></ul>
</dd><dt>Modified methods
<dd><ul><li>
<p>Array#to_h now accepts a block that maps elements to new key/value pairs. [Feature #15143]</p>
</li></ul>
</dd><dt>Aliased methods
<dd><ul><li>
<p>Array#filter is a new alias for Array#select. [Feature #13784]</p>
</li><li>
<p>Array#filter! is a new alias for Array#select!. [Feature #13784]</p>
</li></ul>
</dd></dl>
</dd><dt>Binding
<dd><dl class="rdoc-list label-list"><dt>New methods
<dd><ul><li>
<p>Added Binding#source_location. [Feature #14230]</p>
<p>This method returns the source location of the binding, a 2-element array of <code>__FILE__</code> and <code>__LINE__</code>. Traditionally, the same information could be retrieved by <code>eval("[__FILE__, __LINE__]", binding)</code>, but we are planning to change this behavior so that Kernel#eval ignores binding’s source location [Bug #4352]. So, users should use this newly-introduced method instead of Kernel#eval.</p>
</li></ul>
</dd></dl>
</dd><dt>Dir
<dd><dl class="rdoc-list label-list"><dt>New methods
<dd><ul><li>
<p>Added Dir#each_child and Dir#children instance methods. [Feature #13969]</p>
</li></ul>
</dd></dl>
</dd><dt>Enumerable
<dd><dl class="rdoc-list label-list"><dt>New methods
<dd><ul><li>
<p>Enumerable#chain returns an enumerator object that iterates over the elements of the receiver and then those of each argument in sequence. [Feature #15144]</p>
</li></ul>
</dd><dt>Modified methods
<dd><ul><li>
<p>Enumerable#to_h now accepts a block that maps elements to new key/value pairs. [Feature #15143]</p>
</li></ul>
</dd><dt>Aliased methods
<dd><ul><li>
<p>Enumerable#filter is a new alias for Enumerable#select. [Feature #13784]</p>
</li></ul>
</dd></dl>
</dd><dt>Enumerator::ArithmeticSequence
<dd><ul><li>
<p>This is a new class to represent a generator of an arithmetic sequence, that is a number sequence defined by a common difference. It can be used for representing what is similar to Python’s slice. You can get an instance of this class from Numeric#step and Range#step.</p>
</li></ul>
</dd><dt>Enumerator::Chain
<dd><ul><li>
<p>This is a new class to represent a chain of enumerables that works as a single enumerator, generated by such methods as Enumerable#chain and Enumerator#+.</p>
</li></ul>
</dd><dt>Enumerator::Lazy
<dd><dl class="rdoc-list label-list"><dt>Aliased methods
<dd><ul><li>
<p>Enumerator::Lazy#filter is a new alias for Enumerator::Lazy#select. [Feature #13784]</p>
</li></ul>
</dd></dl>
</dd><dt>Enumerator
<dd><dl class="rdoc-list label-list"><dt>New methods
<dd><ul><li>
<p>Enumerator#+ returns an enumerator object that iterates over the elements of the receiver and then those of the other operand. [Feature #15144]</p>
</li></ul>
</dd></dl>
</dd><dt>ENV
<dd><dl class="rdoc-list label-list"><dt>Modified methods
<dd><ul><li>
<p>ENV.to_h now accepts a block that maps names and values to new keys and values. [Feature #15143]</p>
</li></ul>
</dd></dl>
</dd><dt>Exception
<dd><dl class="rdoc-list label-list"><dt>New options
<dd><ul><li>
<p>Exception#full_message takes <code>:highlight</code> and <code>:order</code> options. [Bug #14324]</p>
</li></ul>
</dd></dl>
</dd><dt>Hash
<dd><dl class="rdoc-list label-list"><dt>Modified methods
<dd><ul><li>
<p>Hash#merge, Hash#merge!, and Hash#update now accept multiple arguments. [Feature #15111]</p>
</li><li>
<p>Hash#to_h now accepts a block that maps keys and values to new keys and values. [Feature #15143]</p>
</li></ul>
</dd><dt>Aliased methods
<dd><ul><li>
<p>Hash#filter is a new alias for Hash#select. [Feature #13784]</p>
</li><li>
<p>Hash#filter! is a new alias for Hash#select!. [Feature #13784]</p>
</li></ul>
</dd></dl>
</dd><dt>IO
<dd><dl class="rdoc-list label-list"><dt>New options
<dd><ul><li>
<p>Added new mode character <code>'x'</code> to open files for exclusive access. [Feature #11258]</p>
</li></ul>
</dd></dl>
</dd><dt>Kernel
<dd><dl class="rdoc-list label-list"><dt>Aliased methods
<dd><ul><li>
<p>Kernel#then is a new alias for Kernel#yield_self. [Feature #14594]</p>
</li></ul>
</dd><dt>New options
<dd><ul><li>
<p>Kernel#Complex, Kernel#Float, Kernel#Integer, and Kernel#Rational take an <code>:exception</code> option to specify the way of error handling. [Feature #12732]</p>
</li><li>
<p>Kernel#system takes an <code>:exception</code> option to raise an exception on failure. [Feature #14386]</p>
</li></ul>
</dd><dt>Incompatible changes
<dd><ul><li>
<p>Kernel#system and Kernel#exec do not close non-standard file descriptors (the default of the <code>:close_others</code> option is changed to <code>false</code>, but we still set the <code>FD_CLOEXEC</code> flag on descriptors we create). [Misc #14907]</p>
</li></ul>
</dd></dl>
</dd><dt>KeyError
<dd><dl class="rdoc-list label-list"><dt>New options
<dd><ul><li>
<p>KeyError.new accepts <code>:receiver</code> and <code>:key</code> options to set receiver and key in Ruby code. [Feature #14313]</p>
</li></ul>
</dd></dl>
</dd><dt>Method
<dd><dl class="rdoc-list label-list"><dt>New methods
<dd><ul><li>
<p>Added Method#<< and Method#>> for Proc composition. [Feature #6284]</p>
</li></ul>
</dd></dl>
</dd><dt>Module
<dd><dl class="rdoc-list label-list"><dt>Modified methods
<dd><ul><li>
<p>Module#method_defined?, Module#private_method_defined?, and Module#protected_method_defined? now accept the second parameter as optional. If it is <code>true</code> (the default value), it checks ancestor modules/classes, or checks only the class itself. [Feature #14944]</p>
</li></ul>
</dd></dl>
</dd><dt>NameError
<dd><dl class="rdoc-list label-list"><dt>New options
<dd><ul><li>
<p>NameError.new accepts a <code>:receiver</code> option to set receiver in Ruby code. [Feature #14313]</p>
</li></ul>
</dd></dl>
</dd><dt>NilClass
<dd><dl class="rdoc-list label-list"><dt>New methods
<dd><ul><li>
<p>NilClass#=~ is added for compatibility. [Feature #15231]</p>
</li></ul>
</dd></dl>
</dd><dt>NoMethodError
<dd><dl class="rdoc-list label-list"><dt>New options
<dd><ul><li>
<p>NoMethodError.new accepts a <code>:receiver</code> option to set receiver in Ruby code. [Feature #14313]</p>
</li></ul>
</dd></dl>
</dd><dt>Numeric
<dd><dl class="rdoc-list label-list"><dt>Incompatible changes
<dd><ul><li>
<p>Numeric#step now returns an instance of the Enumerator::ArithmeticSequence class rather than one of the Enumerator class.</p>
</li></ul>
</dd></dl>
</dd><dt>OpenStruct
<dd><dl class="rdoc-list label-list"><dt>Modified methods
<dd><ul><li>
<p>OpenStruct#to_h now accepts a block that maps keys and values to new keys and values. [Feature #15143]</p>
</li></ul>
</dd></dl>
</dd><dt>Proc
<dd><dl class="rdoc-list label-list"><dt>New methods
<dd><ul><li>
<p>Added Proc#<< and Proc#>> for Proc composition. [Feature #6284]</p>
</li></ul>
</dd><dt>Incompatible changes
<dd><ul><li>
<p>Proc#call doesn’t change <code>$SAFE</code> any more. [Feature #14250]</p>
</li></ul>
</dd></dl>
</dd><dt>Random
<dd><dl class="rdoc-list label-list"><dt>New methods
<dd><ul><li>
<p>Added Random.bytes. [Feature #4938]</p>
</li></ul>
</dd></dl>
</dd><dt>Range
<dd><dl class="rdoc-list label-list"><dt>New methods
<dd><ul><li>
<p>Added Range#% instance method. [Feature #14697]</p>
</li></ul>
</dd><dt>Incompatible changes
<dd><ul><li>
<p>Range#=== now uses the <code>#cover?</code> instead of the <code>#include?</code> method. [Feature #14575]</p>
</li><li>
<p>Range#cover? now accepts a Range object. [Feature #14473]</p>
</li><li>
<p>Range#step now returns an instance of the Enumerator::ArithmeticSequence class rather than one of the Enumerator class.</p>
</li></ul>
</dd></dl>
</dd><dt>Regexp/String
<dd><ul><li>
<p>Update Unicode version to 12.1.0, adding support for U+32FF SQUARE ERA NAME REIWA [Feature #15195]</p>
</li><li>
<p>Update Unicode version and Emoji version from 11.0.0 to 12.0.0. [Feature #15321]</p>
</li><li>
<p>Update Unicode version from 10.0.0 to 11.0.0. [Feature #14802]</p>
<p>This includes a rewrite of the grapheme cluster (/X/) algorithm and special-casing for Georgian MTAVRULI on String#downcase.</p>
</li><li>
<p>Update Emoji version from 5.0 to 11.0.0 [Feature #14802]</p>
</li></ul>
</dd><dt>RubyVM::AbstractSyntaxTree
<dd><dl class="rdoc-list label-list"><dt>New methods
<dd><ul><li>
<p>RubyVM::AbstractSyntaxTree.parse parses a given string and returns AST nodes. [experimental]</p>
</li><li>
<p>RubyVM::AbstractSyntaxTree.parse_file parses a given file and returns AST nodes. [experimental]</p>
</li><li>
<p>RubyVM::AbstractSyntaxTree.of returns AST nodes of the given proc or method.</p>
<dl class="rdoc-list label-list"><dt>experimental
<dd></dd></dl>
</li></ul>
</dd></dl>
</dd><dt>RubyVM
<dd><dl class="rdoc-list label-list"><dt>New methods
<dd><ul><li>
<p>RubyVM.resolve_feature_path identifies the file that will be loaded by “require(feature)”. [experimental] [Feature #15230]</p>
</li></ul>
</dd></dl>
</dd><dt>String
<dd><ul><li>
<p>String#crypt is now deprecated. [Feature #14915]</p>
</li></ul>
<dl class="rdoc-list label-list"><dt>New features
<dd><ul><li>
<p>String#split yields each substring to the block if given. [Feature #4780]</p>
</li></ul>
</dd></dl>
</dd><dt>Struct
<dd><dl class="rdoc-list label-list"><dt>Modified methods
<dd><ul><li>
<p>Struct#to_h now accepts a block that maps keys and values to new keys and values. [Feature #15143]</p>
</li></ul>
</dd><dt>Aliased method
<dd><ul><li>
<p>Struct#filter is a new alias for Struct#select. [Feature #13784]</p>
</li></ul>
</dd></dl>
</dd><dt>Time
<dd><dl class="rdoc-list label-list"><dt>New features
<dd><ul><li>
<p>Time.new and Time#getlocal accept a timezone object as well as a UTC offset string. Time#+, Time#-, and Time#succ also preserve the timezone. [Feature #14850]</p>
</li></ul>
</dd></dl>
</dd><dt>TracePoint
<dd><dl class="rdoc-list label-list"><dt>New features
<dd><ul><li>
<p>“script_compiled” event is supported. [Feature #15287]</p>
</li></ul>
</dd><dt>New methods
<dd><ul><li>
<p>TracePoint#parameters [Feature #14694]</p>
</li><li>
<p>TracePoint#instruction_sequence [Feature #15287]</p>
</li><li>
<p>TracePoint#eval_script [Feature #15287]</p>
</li></ul>
</dd><dt>Modified methods
<dd><ul><li>
<p>TracePoint#enable accepts new keywords “target:” and “target_line:”.</p>
<dl class="rdoc-list label-list"><dt>Feature #15289
<dd></dd></dl>
</li></ul>
</dd></dl>
</dd></dl>
<h3 id="label-Stdlib+updates+-28outstanding+ones+only-29">Stdlib updates (outstanding ones only)</h3>
<dl class="rdoc-list label-list"><dt>BigDecimal
<dd>
<p>Update to version 1.4.0. This version includes several compatibility issues, see Compatibility issues section below for details.</p>
<dl class="rdoc-list label-list"><dt>Modified methods
<dd></dd></dl>
<ul><li>
<p>BigDecimal() accepts the new keyword “exception:” similar to Float().</p>
</li></ul>
<dl class="rdoc-list label-list"><dt>Note for the differences among recent versions
<dd>
<p>You should want to know the differences among recent versions of bigdecimal. Please select the suitable version of bigdecimal according to the following information.</p>
<ul><li>
<p>1.3.5 has BigDecimal.new without “exception:” keyword. You can see the deprecation warning of BigDecimal.new when you specify “-w” option. BigDecimal(), BigDecimal.new, and Object#to_d methods are the same.</p>
</li><li>
<p>1.4.0 has BigDecimal.new with “exception:” keyword. You always see the deprecation warning of BigDecimal.new. Object#to_d method is different from BigDecimal() and BigDecimal.new.</p>
</li><li>
<p>2.0.0 will be released soon after releasing Ruby 2.6.0. This version will not have the BigDecimal.new method.</p>
</li></ul>
</dd></dl>
</dd><dt>Bundler
<dd><ul><li>
<p>Add Bundler to Standard Library. [Feature #12733]</p>
</li><li>
<p>Use 1.17.2, the latest stable version.</p>
</li></ul>
</dd><dt>Coverage
<dd>
<p>A oneshot_lines mode is added. [Feature #15022]</p>
<p>This mode checks “whether each line was executed at least once or not”, instead of “how many times each line was executed”. A hook for each line is fired at most once, and after it is fired the hook flag is removed, i.e., it runs with zero overhead.</p>
<dl class="rdoc-list label-list"><dt>New options
<dd><ul><li>
<p>Add <code>:oneshot_lines</code> keyword argument to Coverage.start.</p>
</li><li>
<p>Add <code>:stop</code> and <code>:clear</code> keyword arguments to Coverage.result. If <code>clear</code> is true, it clears the counters to zero. If <code>stop</code> is true, it disables coverage measurement.</p>
</li></ul>
</dd><dt>New methods
<dd><ul><li>
<p>Coverage.line_stub, which is a simple helper function that creates the “stub” of line coverage from a given source code.</p>
</li></ul>
</dd></dl>
</dd><dt>CSV
<dd><ul><li>
<p>Upgrade to 3.0.2. This includes performance improvements especially for writing. Writing is about 2 times faster. See <a href="https://github.com/ruby/csv/blob/master/NEWS.md">github.com/ruby/csv/blob/master/NEWS.md</a>.</p>
</li></ul>
</dd><dt>ERB
<dd><dl class="rdoc-list label-list"><dt>New options
<dd><ul><li>
<p>Add <code>:trim_mode</code> and <code>:eoutvar</code> keyword arguments to ERB.new. Now non-keyword arguments other than the first one are softly deprecated and will be removed when Ruby 2.5 becomes EOL. [Feature #14256]</p>
</li><li>
<p>erb command’s <code>-S</code> option is deprecated, and will be removed in the next version.</p>
</li></ul>
</dd></dl>
</dd><dt>FileUtils
<dd><dl class="rdoc-list label-list"><dt>New methods
<dd><ul><li>
<p>FileUtils#cp_lr. [Feature #4189]</p>
</li></ul>
</dd></dl>
</dd><dt>Matrix
<dd><dl class="rdoc-list label-list"><dt>New methods
<dd><ul><li>
<p>Matrix#antisymmetric?, Matrix#skew_symmetric?</p>
</li><li>
<p>Matrix#map!, Matrix#collect! [Feature #14151]</p>
</li><li>
<p>Matrix#[]=</p>
</li><li>
<p>Vector#map!, Vector#collect!</p>
</li><li>
<p>Vector#[]=</p>
</li></ul>
</dd></dl>
</dd><dt>Net
<dd><dl class="rdoc-list label-list"><dt>New options
<dd><ul><li>
<p>Add <code>:write_timeout</code> keyword argument to Net::HTTP.new. [Feature #13396]</p>
</li></ul>
</dd><dt>New methods
<dd><ul><li>
<p>Add Net::HTTP#write_timeout and Net::HTTP#write_timeout=. [Feature #13396]</p>
</li></ul>
</dd><dt>New constant
<dd><ul><li>
<p>Add Net::HTTPClientException to deprecate Net::HTTPServerException, whose name is misleading. [Bug #14688]</p>
</li></ul>
</dd><dt>Net::IMAP
<dd><ul><li>
<p>Add Server Name Indication (SNI) support. [Feature #15594]</p>
</li></ul>
</dd></dl>
</dd><dt>NKF
<dd><ul><li>
<p>Upgrade to nkf v2.1.5</p>
</li></ul>
</dd><dt>Psych
<dd><ul><li>
<p>Upgrade to Psych 3.1.0</p>
</li></ul>
</dd><dt>RDoc
<dd><ul><li>
<p>Become about 2 times faster.</p>
</li><li>
<p>Use SOURCE_DATE_EPOCH to generate files.</p>
</li><li>
<p>Fix method line number that slipped off.</p>
</li><li>
<p>Enable <code>--width</code>, <code>--exclude</code>, and <code>--line-numbers</code> that were ignored.</p>
</li><li>
<p>Add support for blockquote by “>>>” in default markup notation.</p>
</li><li>
<p>Add support for “Raises” lines in TomDoc notation.</p>
</li><li>
<p>Fix syntax error output.</p>
</li><li>
<p>Fix many parsing bugs.</p>
</li></ul>
</dd><dt>REXML
<dd><ul><li>
<p>Upgrade to REXML 3.1.9. See <a href="https://github.com/ruby/rexml/blob/master/NEWS.md">github.com/ruby/rexml/blob/master/NEWS.md</a>.</p>
</li></ul>
<dl class="rdoc-list label-list"><dt>Improved some XPath implementations
<dd><ul><li>
<p><code>concat()</code> function: Stringify all arguments before concatenating.</p>
</li><li>
<p><code>string()</code> function: Support context node.</p>
</li><li>
<p><code>string()</code> function: Support processing instruction node.</p>
</li><li>
<p>Support <code>"*:#{ELEMENT_NAME}"</code> syntax in XPath 2.0.</p>
</li></ul>
</dd><dt>Fixed some XPath implementations
<dd><ul><li>
<p><code>"//#{ELEMENT_NAME}[#{POSITION}]"</code> case</p>
</li><li>
<p><code>string()</code> function: Fix <code>function(document)</code> returns nodes that are out of root elements.</p>
</li><li>
<p><code>"/ #{ELEMENT_NAME} "</code> case</p>
</li><li>
<p><code>"/ #{ELEMENT_NAME} [ #{PREDICATE} ]"</code> case</p>
</li><li>
<p><code>"/ #{AXIS}::#{ELEMENT_NAME}"</code> case</p>
</li><li>
<p><code>"#{N}-#{M}"</code> case: One or more white spaces were required before <code>"-"</code></p>
</li><li>
<p><code>"/child::node()"</code> case</p>
</li><li>
<p><code>"#{FUNCTION}()/#{PATH}"</code> case</p>
</li><li>
<p><code>"@#{ATTRIBUTE}/parent::"</code> case</p>
</li><li>
<p><code>"name(#{NODE_SET})"</code> case</p>
</li></ul>
</dd></dl>
</dd><dt>CSV
<dd><ul><li>
<p>Upgrade to 3.0.9. See <a href="https://github.com/ruby/csv/blob/master/NEWS.md">github.com/ruby/csv/blob/master/NEWS.md</a>.</p>
</li></ul>
</dd><dt>Date
<dd><ul><li>
<p>Date.jisx0301, Date#jisx0301, and Date.parse provisionally support the new Japanese era as an informal extension, until the new JIS X 0301 is issued. [Feature #15742]</p>
</li></ul>
</dd><dt>RSS
<dd><dl class="rdoc-list label-list"><dt>New options
<dd><ul><li>
<p>RSS::Parser.parse now accepts options as Hash. <code>:validate</code> , <code>:ignore_unknown_element</code> , <code>:parser_class</code> options are available.</p>
</li></ul>
</dd></dl>
</dd><dt>RubyGems
<dd><ul><li>
<p>Upgrade to RubyGems 3.0.1</p>
</li><li>
<p><a href="https://blog.rubygems.org/2018/12/19/3.0.0-released.html">blog.rubygems.org/2018/12/19/3.0.0-released.html</a></p>
</li><li>
<p><a href="https://blog.rubygems.org/2018/12/23/3.0.1-released.html">blog.rubygems.org/2018/12/23/3.0.1-released.html</a></p>
</li></ul>
</dd><dt>Set
<dd><dl class="rdoc-list label-list"><dt>Aliased methods
<dd><ul><li>
<p>Set#filter! is a new alias for Set#select!. [Feature #13784]</p>
</li></ul>
</dd></dl>
</dd><dt>URI
<dd><dl class="rdoc-list label-list"><dt>New constant
<dd><ul><li>
<p>Add URI::File to handle the file URI scheme. [Feature #14035]</p>
</li></ul>
</dd></dl>
</dd></dl>
<h3 id="label-Compatibility+issues+-28excluding+feature+bug+fixes-29">Compatibility issues (excluding feature bug fixes)</h3>
<dl class="rdoc-list label-list"><dt>Dir
<dd><ul><li>
<p>Dir.glob with <code>'\0'</code>-separated pattern list will be deprecated, and is now warned. [Feature #14643]</p>
</li></ul>
</dd><dt>File
<dd><ul><li>
<p>File.read, File.binread, File.write, File.binwrite, File.foreach, and File.readlines do not invoke external commands even if the path starts with the pipe character <code>'|'</code>. [Feature #14245]</p>
</li></ul>
</dd><dt>Object
<dd><ul><li>
<p>Object#=~ is deprecated. [Feature #15231]</p>
</li></ul>
</dd></dl>
<h3 id="label-Stdlib+compatibility+issues+-28excluding+feature+bug+fixes-29">Stdlib compatibility issues (excluding feature bug fixes)</h3>
<ul><li>
<p>These standard libraries have been promoted to default gems.</p>
<ul><li>
<p>e2mmap</p>
</li><li>
<p>forwardable</p>
</li><li>
<p>irb</p>
</li><li>
<p>logger</p>
</li><li>
<p>matrix</p>
</li><li>
<p>mutex_m</p>
</li><li>
<p>ostruct</p>
</li><li>
<p>prime</p>
</li><li>
<p>rexml</p>
</li><li>
<p>rss</p>
</li><li>
<p>shell</p>
</li><li>
<p>sync</p>
</li><li>
<p>thwait</p>
</li><li>
<p>tracer</p>
</li></ul>
</li></ul>
<dl class="rdoc-list label-list"><dt>BigDecimal
<dd><ul><li>
<p>The following methods are removed.</p>
<ul><li>
<p>BigDecimal.allocate</p>
</li><li>
<p>BigDecimal.ver</p>
</li></ul>
</li><li>
<p>Every BigDecimal object is frozen. [Feature #13984]</p>
</li><li>
<p>BigDecimal() parses the given string similar to Float().</p>
</li><li>
<p>String#to_d parses the receiver string similar to String#to_f.</p>
</li><li>
<p>BigDecimal.new will be removed in version 2.0.</p>
</li></ul>
</dd><dt>Pathname
<dd><ul><li>
<p>Pathname#read, Pathname#binread, Pathname#write, Pathname#binwrite, Pathname#each_line and Pathname#readlines do not invoke external commands even if the path starts with the pipe character <code>'|'</code>. This follows [Feature #14245].</p>
</li></ul>
</dd></dl>
<h3 id="label-C+API+updates">C API updates</h3>
<h3 id="label-Implementation+improvements">Implementation improvements</h3>
<ul><li>
<p>Speedup Proc#call because we don’t need to care about <code>$SAFE</code> any more. [Feature #14318]</p>
<p>With <code>lc_fizzbuzz</code> benchmark which uses Proc#call many times we can measure x1.4 improvements. [Bug #10212]</p>
</li><li>
<p>Speedup block.call where <code>block</code> is passed block parameter. [Feature #14330]</p>
<p>Ruby 2.5 improves block passing performance. [Feature #14045]</p>
<p>Additionally, Ruby 2.6 improves the performance of passed block calling.</p>
</li><li>
<p>Introduce an initial implementation of a JIT (Just-in-time) compiler. [Feature #14235] [experimental]</p>
<ul><li>
<p><code>--jit</code> command line option is added to enable JIT. <code>--jit-verbose=1</code> is good for inspection. See <code>ruby --help</code> for others.</p>
</li><li>
<p>To generate machine code, this JIT compiler uses the C compiler used for building the interpreter. Currently GCC, Clang, and Microsoft Visual C++ are supported for it.</p>
</li><li>
<p><code>--disable-mjit-support</code> option is added to configure. This is added for JIT debugging, but if you get an error on building a header file for JIT, you can use this option to skip building it as a workaround.</p>
</li><li>
<p>rb_waitpid reimplemented on Unix-like platforms to maintain compatibility with processes created for JIT [Bug #14867]</p>
</li></ul>
</li><li>
<p>VM generator script renewal; makes the generated VM more optimized. [GH-1779]</p>
</li><li>
<p>Thread cache enabled for pthreads platforms (for Thread.new and Thread.start). [Feature #14757]</p>
</li><li>
<p>timer thread is eliminated for platforms with POSIX timers. [Misc #14937]</p>
</li><li>
<p>Transient Heap (theap) is supported. [Bug #14858] [Feature #14989]</p>
<p>theap is a managed heap for short-living memory objects. For example, making a small and short-living Hash object is x2 faster. With rdoc benchmark, we measured 6-7% performance improvement.</p>
</li><li>
<p>Native implementations (arm32, arm64, ppc64le, win32, win64, x86, amd64) of coroutines to improve performance of Fiber significantly. [Feature #14739]</p>
</li></ul>
<h3 id="label-Miscellaneous+changes">Miscellaneous changes</h3>
<ul><li>
<p>On macOS, shared libraries no longer include a full version number of Ruby in their names. This eliminates the burden of each teeny upgrade on the platform that users need to rebuild every extension library.</p>
<dl class="rdoc-list label-list"><dt>Before
<dd><ul><li>
<p>libruby.2.6.0.dylib</p>
</li><li>
<p>libruby.2.6.dylib -> libruby.2.6.0.dylib</p>
</li><li>
<p>libruby.dylib -> libruby.2.6.0.dylib</p>
</li></ul>
</dd><dt>After
<dd><ul><li>
<p>libruby.2.6.dylib</p>
</li><li>
<p>libruby.dylib -> libruby.2.6.dylib</p>
</li></ul>
</dd></dl>
</li><li>
<p>Extracted misc/*.el files to <a href="https://github.com/ruby/elisp">github.com/ruby/elisp</a></p>
</li></ul>
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