docs: private void setDefaultSerializeSettings() {
          if (!serializeSettings.containsKey(ELEMENT_CONTENT_WHITESPACE)) {
              serializeSettings.put(ELEMENT_CONTENT_WHITESPACE, true);
          }
  
          if (!serializeSettings.containsKey(SPLIT_CDATA_SECTIONS)) {
              serializeSettings.put(SPLIT_CDATA_SECTIONS, false);
          }
  
          if (!serializeSettings.containsKey(FORMAT_PRETTY_PRINT)) {
              serializeSettings.put(FORMAT_PRETTY_PRINT, true);
          }
  
          if (!serializeSettings.containsKey(XML_DECLARATION)) {
              serializeSettings.put(XML_DECLARATION, true);
          }
      }