[xml] Serialization of documents without encoding

[Nick Wellnhofer]

libxml2 serializes documents without an encoding declaration differently than 
documents with an explicit UTF-8 encoding:

$ echo '<?xml version="1.0"?><doc>Käse</doc>' |xmllint -
<?xml version="1.0"?>
<doc>K&#xE4;se</doc>
$ echo '<?xml version="1.0" encoding="utf-8"?><doc>Käse</doc>' |xmllint -
<?xml version="1.0" encoding="utf-8"?>
<doc>Käse</doc>

Since the encoding should default to UTF-8, can anyone explain why this 
decision was made?

Nick
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