code: function radialNextAngle(options, i, s) {
      if (options.exactTicks) {
          let ratio = options.ticksAngle / (options.maxValue - options.minValue);
          return options.startAngle + ratio * (i - options.minValue);
      }
  
      return options.startAngle + i * (options.ticksAngle / (s - 1));
  }
docs: /* istanbul ignore next: private, not testable