Ruby 4.0 released

Once again there is a brand-new release under the tree from theRuby programming-language project: Ruby4.0has been released with many new features and improvements. Notablechanges include the experimental Ruby Boxfeature for in-process isolation of classes and modules, a newjust-in-time compiler called ZJIT, and improvements to Ruby'sparallel-execution mechanism (Ractor). There are a number of languagechanges as well. See the documentationfor Ruby4.0 for more.