docs: public int indexOf(final byte b, final int from, final int to) {
          int beginIndex = from;
          if (beginIndex < 0) {
              beginIndex = 0;
          }
          int endIndex = to;
          if (endIndex > this.len) {
              endIndex = this.len;
          }
          if (beginIndex > endIndex) {
              return -1;
          }
          for (int i = beginIndex; i < endIndex; i++) {
              if (this.array[i] == b) {
                  return i;
              }
          }
          return -1;
      }