handleIncrement (step = this.step) {
      if (!this.isInteractive) return
      let nextValue = Number(this._value) + Number(step)

      if (this.keepWithinRange) {
        nextValue = Math.min(nextValue, this.max)
      }

      nextValue = roundToPrecision(nextValue, this._precision)
      this.updateValue(nextValue)
      this.$emit('increment', nextValue)
      this.focusInput()
    }
Handles value increment
@param {Number} step Value to be incremented