In xsltParseStylesheetOutput(), "cdata-section-elements": A QName which expanded using the default namespace, is incorrectly added twice to the hash: once with no namespace and once with the default namespace; thus the serialization will generate CDATA-sections for:
1) elements with the specified local-name in *no* namespace
2) elements with the specified local-name in the default namespace

Example:

"cdata-2.xsl"
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns="urn:test:foo" xmlns:foo="urn:test:foo">
  <xsl:output cdata-section-elements="foo"/>
  <xsl:template match="/" xmlns="">
    <foo>foo<foo:foo>zoo</foo:foo></foo>
  </xsl:template>  
</xsl:stylesheet>

xsltproc cdata-2.xsl cdata-2.xml
<?xml version="1.0"?>
<foo xmlns="" xmlns:foo="urn:test:foo"><![CDATA[foo]]><foo:foo><![CDATA[zoo]]></foo:foo></foo>

Expected result:
<?xml version="1.0"?>
<foo xmlns:foo="urn:test:foo">foo<foo:foo><![CDATA[zoo]]></foo:foo></foo>