docs: public EqualsBuilder append(final Object lhs, final Object rhs) {
          if (isEquals == false) {
              return this;
          }
          if (lhs == rhs) {
              return this;
          }
          if (lhs == null || rhs == null) {
              this.setEquals(false);
              return this;
          }
          final Class<?> lhsClass = lhs.getClass();
          if (!lhsClass.isArray()) {
              // The simple case, not an array, just test the element
              isEquals = lhs.equals(rhs);
          } else if (lhs.getClass() != rhs.getClass()) {
              // Here when we compare different dimensions, for example: a boolean[][] to a boolean[]
              this.setEquals(false);
          }
          // 'Switch' on type of array, to dispatch to the correct handler
          // This handles multi dimensional arrays of the same depth
          else if (lhs instanceof long[]) {
              append((long[]) lhs, (long[]) rhs);
          }