freemarker-core/src/main/java/freemarker/template/utility/TemplateModelUtils.java [269:280]:
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        private static void addKeys(Set<String> keySet, SimpleSequence keySeq, TemplateHashModelEx hash)
                throws TemplateModelException {
            TemplateModelIterator it = hash.keys().iterator();
            while (it.hasNext()) {
                TemplateScalarModel tsm = (TemplateScalarModel) it.next();
                if (keySet.add(tsm.getAsString())) {
                    // The first occurrence of the key decides the index;
                    // this is consistent with the behavior of java.util.LinkedHashSet.
                    keySeq.add(tsm);
                }
            }
        }        
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freemarker-core/src/main/java/freemarker/core/AddConcatExpression.java [527:538]:
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        private static void addKeys(Set keySet, SimpleSequence keySeq, TemplateHashModelEx hash)
        throws TemplateModelException {
            TemplateModelIterator it = hash.keys().iterator();
            while (it.hasNext()) {
                TemplateScalarModel tsm = (TemplateScalarModel) it.next();
                if (keySet.add(tsm.getAsString())) {
                    // The first occurrence of the key decides the index;
                    // this is consistent with the behavior of java.util.LinkedHashSet.
                    keySeq.add(tsm);
                }
            }
        }        
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