ox: Single carriage return is not converted to line feed

As described on https://www.w3.org/TR/2008/REC-xml-20081126/#sec-line-ends, a single carriage return should be converted to a line feed, but ox doesn’t convert it. Is this behavior expected? Actually, other XML libraries such as nokogiri and rexml convert it:

require 'nokogiri'
require 'ox'
require 'rexml'

class Handler
  def text(value)
    p value
  end
  alias_method :characters, :text

  def method_missing(*args); end
end

xml = "<xml><value>foo\rbar</value></xml>"
handler = Handler.new

puts '== nokogiri =='
Nokogiri::XML::SAX::Parser.new(handler).parse(xml)
puts '== rexml =='
REXML::Parsers::StreamParser.new(REXML::Source.new(xml), handler).parse
puts '== ox with skip_return =='
Ox.sax_parse(handler, xml, { skip: :skip_return })
puts '== ox with skip_white =='
Ox.sax_parse(handler, xml, { skip: :skip_white })

The output is here:

== nokogiri ==
"foo"
"\nbar"
== rexml ==
"foo\nbar"
== ox with skip_return ==
"foo\rbar"
== ox with skip_white ==
"foo bar"