(URGENT) raw: true option should keep strings unescaped in to_xml output

[andrew2net]

In the example, description content is parsed correctly, but all tags are escaped in XML output:

class Person < Lutaml::Model::Serializable
  attribute :name, :string
  attribute :description, :string, raw: true
end

> xml = <<~XML
<Person>
  <name>John Doe</name>
  <description>
    A <b>fictional person</b> commonly used as a <i>placeholder name</i>.
  </description>
</Person>
XML

> person = Person.from_xml(xml)
> person.description
"\n  A <b>fictional person</b> commonly used as a <i>placeholder name</i>.\n"

> person.to_xml
<Person>
  <name>John Doe</name>
  <description>
    A &lt;b&gt;fictional person&lt;/b&gt; commonly used as a &lt;i&gt;placeholder name&lt;/i&gt;.
  </description>
</Person>