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The fix for issue 257348 is incomplete: it doesn't work well with clone, equals and hashcode. http://hg.netbeans.org/html4j/rev/3ef632633f36
changeset: 1049:3b01a425dfcb tag: tip user: Jaroslav Tulach <jtulach@netbeans.org> date: Sat Oct 08 07:26:05 2016 +0200 summary: #268314: Better infinite equality
Will be fixed in 1.4 version.