Saxy does parse but does not encode properly

[StephanMeijer]

When loading in a document using Saxy.SimpleForm.parse_string such as

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<text>&gt;</text>

The result is correctly parsed as:

{"text", [], [">"]}

But when encoding back using Saxy.encode!(simple), result is encoded as:

<text>></text>

So the > character was not properly encoded to >.

---

Reproduce:

    {:ok, simple} = Saxy.SimpleForm.parse_string("""
    <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
    <text>&gt;</text>
    """)

    IO.inspect(simple)

    encoded = Saxy.encode!(simple)

    IO.inspect(encoded)

Output:

{"text", [], [">"]}
"<text>></text>"

[StephanMeijer]

While this functions properly, I would like this to either be more well-documented or have behaviours of .parse_string and .encode! be compatible by default:

{:ok, simple} = Saxy.SimpleForm.parse_string("""
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<text>&gt;</text>
""", [expand_entity: :never])

IO.inspect(simple)

encoded = Saxy.encode!(simple)

IO.inspect(encoded)