[issue27940] xml.etree: Avoid XML declaration for the "ascii" encoding

[STINNER Victor]

STINNER Victor added the comment:

New patch:

* Avoid codecs.lookup() for method != "xml"
* More unit tests

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Added file: http://bugs.python.org/file44385/etree_xml_declaration-2.patch

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<http://bugs.python.org/issue27940>
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