v4.0.0

Features:

• Undeprecate Gem::Version.new(nil). Pull request
  #9086 by tenderlove
• Add pattern matching support to Gem::NameTuple. Pull request
  #9064 by baweaver
• Add pattern matching support to Gem::Platform. Pull request
  #9062 by baweaver

Performance:

• Add MAKEFLAGS=-j by default before compiling. Pull request
  #9131 by Edouard-chin
• Remove some memoization. Pull request
  #9017 by tenderlove
• Pull Gem.win_platform? out of a hot path. Pull request
  #8983 by tenderlove
• Stop trying to remove every file on extraction. Pull request
  #8974 by tenderlove
• Use IO.copy_stream with IO object directly. Pull request
  #8970 by tenderlove
• Pass a file size to IO.copy_stream. Pull request
  #8966 by tenderlove
• Use File#chmod rather than FileUtils.chmod. Pull request
  #8965 by tenderlove

Enhancements:

• Update all vendored libraries to latest version. Pull request
  #9089 by hsbt
• Removed unused Gem::Deprecate. Pull request
  #9090 by hsbt
• Add debug logging information to see the time it took to download and
  install a gem. Pull request
  #9066 by Edouard-chin
• Fix constants in TAR to be frozen. Pull request
  #9041 by tenderlove
• Remove open-ended and prerelease dependency warnings when building gems.
  Pull request #9050 by
  jeremyevans
• Revamp CmakeBuilder. Pull request
  #8753 by cfis
• Restrict what schemes are acceptable in the remote fetcher. Pull request
  #9022 by tenderlove
• gem sources --prepend and --append allow finer grained control of
  sources. Pull request #8901
  by martinemde
• Improve gem sources --remove output. Pull request
  #8909 by deivid-rodriguez
• Make gem sources output more clear. Pull request
  #8938 by deivid-rodriguez
• Don't fail if there is no makefile, simply don't do anything. Pull
  request #8879 by ioquatix
• Use IMDSv2 for S3 instance credentials. Pull request
  #7709 by folbricht-stripe
• Fix regression in presence of RVM gems. Pull request
  #8854 by deivid-rodriguez
• Restore parsing "--" as an unknown platform rather than crashing. Pull
  request #8846 by
  deivid-rodriguez
• Installs bundler 4.0.0 as a default gem.

Bug fixes:

• Fix test failure of mswin and nmake. Pull request
  #9135 by hsbt
• Respect BUNDLE_VERSION config at Gem::BundlerVersionFinder. Pull
  request #9106 by hsbt
• Fix "did you mean" suggestions for unknown commands. Pull request
  #8948 by deivid-rodriguez
• Fix trailing slashes not considered by gem sources --remove. Pull
  request #8939 by
  deivid-rodriguez

Security:

• Bump up vendored URI to 1.0.4. Pull request
  #9031 by hsbt

Breaking changes:

• Removed deprecated -C option from gem build. Pull request
  #9088 by hsbt
• Removed deprecated Gem::Specification#has_rdoc, has_rdoc= and has_rdoc?.
  Pull request #9084 by hsbt
• Removed deprecated gem query command. Pull request
  #9083 by hsbt
• Removed deprecated Gem::DependencyInstaller#find_gems_with_sources. Pull
  request #9082 by hsbt
• Remove deprecated methods of RubyGems. Pull request
  #9081 by hsbt
• Make verification methods private. Pull request
  #9051 by tenderlove
• Deprecate --default option from install command. Pull request
  #7588 by hsbt
• Removed compatibility.rb for RG 4.0. Pull request
  #8899 by hsbt

Deprecations:

• Deprecate Gem::Specification#datadir. Pull request
  #8900 by hsbt

Documentation:

• Unified UPGRADING.md and extract blog.rubygems.org. Pull request
  #9148 by hsbt
• Remove italic formatting from changelog section headers. Pull request
  #9128 by hsbt
• [DOC] Fix the location of Gem::Deprecate document. Pull request
  #9065 by nobu
• Fix typo. Pull request
  #9012 by etiennebarrie
• Added document for Gem::Uninstaller. Pull request
  #8904 by hsbt
• Use mailto link in Code of Conduct. Pull request
  #8849 by deivid-rodriguez
• Update Code of Conduct email to [email protected]. Pull request
  #8848 by indirect