--html option breaks encoding

Hello,

I am trying to get an epub out of a html documentation, after some XPath queries. But XPath requires perfectly valid xml, so I tried to format it with xmllint. Then if I'm not mistaken, the --html option breaks the encoding.

Without --html :

$ echo '<title>Introduction — Vue.js</title>' |  xmllint --encode UTF-8 --format  -

[...]
<title>Introduction — Vue.js</title>



With --html (seems to be required for entire documents). The "—" is transformed to "&acirc;&#128;&#148;" :

$ echo '<title>Introduction — Vue.js</title>' |  xmllint --html --htmlout --encode UTF-8 --format -

[...]
<title>Introduction &acirc;&#128;&#148; Vue.js</title>



$ xmllint --version 
xmllint: using libxml version 20904
   compiled with: Threads Tree Output Push Reader Patterns Writer SAXv1 FTP HTTP DTDValid HTML Legacy C14N Catalog XPath XPointer XInclude Iconv ICU ISO8859X Unicode Regexps Automata Expr Schemas Schematron Modules Debug Zlib Lzma


Thanks in advance.
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