Gem::Specification#normalize

# File tmp/rubies/ruby-3.1.3/lib/rubygems/specification.rb, line 2185
def normalize
  if defined?(@extra_rdoc_files) && @extra_rdoc_files
    @extra_rdoc_files.uniq!
    @files ||= []
    @files.concat(@extra_rdoc_files)
  end

  @files            = @files.uniq if @files
  @extensions       = @extensions.uniq if @extensions
  @test_files       = @test_files.uniq if @test_files
  @executables      = @executables.uniq if @executables
  @extra_rdoc_files = @extra_rdoc_files.uniq if @extra_rdoc_files
end