Gem::Package#normalized_required_rubygems_version

# File tmp/rubies/ruby-4.1.0-preview1/lib/rubygems/package.rb, line 758
def normalized_required_rubygems_version(ruby_abi)
  minimum = Gem::Requirement.new(MINIMUM_RUBYGEMS_VERSION)
  existing = @spec.required_rubygems_version

  return minimum if existing.nil? || existing == Gem::Requirement.default

  floor = minimum.requirements.first.last

  if excludes_rubygems_floor?(existing, floor)
    raise ArgumentError,
      "Cannot build gem for Ruby ABI #{ruby_abi} because required_rubygems_version is set to #{existing}, " \
      "which excludes RubyGems #{MINIMUM_RUBYGEMS_VERSION} required to install content addressable gems. " \
      "Please remove or loosen the conflicting constraint."
  end

  return existing if satisfies_rubygems_floor?(existing, floor)

  preserved = existing.requirements.filter_map do |op, version|
    "#{op} #{version}" if ["~>", "<", "<=", "!="].include?(op)
  end

  normalized = Gem::Requirement.new([MINIMUM_RUBYGEMS_VERSION, *preserved])

  alert_warning \
    "required_rubygems_version was changed from \"#{existing}\" to \"#{normalized}\" for this build " \
    "because content addressable gems can only be installed by RubyGems #{MINIMUM_RUBYGEMS_VERSION}."

  normalized
end