Gem::Commands::UpdateCommand#which_to_update

# File tmp/rubies/ruby-3.3.0/lib/rubygems/commands/update_command.rb, line 303
def which_to_update(highest_installed_gems, gem_names)
  result = []

  highest_installed_gems.each do |_l_name, l_spec|
    next if !gem_names.empty? &&
            gem_names.none? {|name| name == l_spec.name }

    highest_remote_tup = highest_remote_name_tuple l_spec
    next unless highest_remote_tup

    result << highest_remote_tup
  end

  result
end