docs: public final double similarity(final String s1, final String s2) {
          int[] mtp = matches(s1, s2);
          float m = mtp[0];
          if (m == 0) {
              return 0f;
          }
          double j = ((m / s1.length() + m / s2.length() + (m - mtp[1]) / m))
                  / THREE;
          double jw = j;
  
          if (j > getThreshold()) {
              jw = j + Math.min(JW_COEF, 1.0 / mtp[THREE]) * mtp[2] * (1 - j);
          }
          return jw;
      }