docs: static boolean isKeyword(Object key) {
          if (!isString(key)) {
              return false;
          }
          return "@base".equals(key) || "@context".equals(key) || "@container".equals(key)
                  || "@default".equals(key) || "@embed".equals(key) || "@explicit".equals(key)
                  || "@graph".equals(key) || "@id".equals(key) || "@index".equals(key)
                  || "@language".equals(key) || "@list".equals(key) || "@omitDefault".equals(key)
                  || "@reverse".equals(key) || "@preserve".equals(key) || "@set".equals(key)
                  || "@type".equals(key) || "@value".equals(key) || "@vocab".equals(key)
                  || "@requireAll".equals(key);
      }