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I found an error in htmlEncode.as when i try to encode a string with several special characters.
I also found 2 solutions...
Switch line 8 and 9, the first one should be
Using this method
return new XML(new XMLNode(XMLNodeType.TEXT_NODE, s)).toXMLString();
to decode use this...
return new XMLDocument(s).firstChild.nodeValue;
Can you make the changes and issue a pull request?
fixed issue #18