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hash table improvements
More information about Ruby 2.4 can be found in the Ruby community's link:++https://www.ruby-lang.org/en/news/2016/12/25/ruby-2-4-0-released/++[ Ruby 2.4.0 Release Notes].
performance and debugging improvements
Ruby Ruby
Ruby 2.4
Ruby 2.4 includes updates to soname and so Ruby packages that use binary extensions should be rebuilt. Nevertheless, since the Ruby community paid great attention to source compatibility, no changes to your code are needed.
Ruby 2.4 is the latest stable version of Ruby. Many new features and improvements are included, for example:
String supports Unicode case mappings
unify Fixnum and Bignum into Integer