_appendValue(value, repetitions = 1) {
    if (repetitions <= 0) return
    if (this.state === "empty") {
      this.state =
        value === null
          ? "nulls"
          : repetitions === 1
            ? "loneValue"
            : "repetition"
      this.lastValue = value
      this.count = repetitions
    } else if (this.state === "loneValue") {
      if (value === null) {
        this.flush()
        this.state = "nulls"
        this.count = repetitions
      } else if (value === this.lastValue) {
        this.state = "repetition"
        this.count = 1 + repetitions
      } else if (repetitions > 1) {
        this.flush()
        this.state = "repetition"
        this.count = repetitions
        this.lastValue = value
      } else {
        this.state = "literal"
        this.literal = [this.lastValue]
        this.lastValue = value
      }
    } else if (this.state === "repetition") {
      if (value === null) {
        this.flush()
        this.state = "nulls"
        this.count = repetitions
      } else if (value === this.lastValue) {
        this.count += repetitions
      } else if (repetitions > 1) {
        this.flush()
        this.state = "repetition"
        this.count = repetitions
        this.lastValue = value
      } else {
        this.flush()
        this.state = "loneValue"
        this.lastValue = value
      }
    } else if (this.state === "literal") {
      if (value === null) {
        this.literal.push(this.lastValue)
        this.flush()
        this.state = "nulls"
        this.count = repetitions
      } else if (value === this.lastValue) {
        this.flush()
        this.state = "repetition"
        this.count = 1 + repetitions
      } else if (repetitions > 1) {
        this.literal.push(this.lastValue)
        this.flush()
        this.state = "repetition"
        this.count = repetitions
        this.lastValue = value
      } else {
        this.literal.push(this.lastValue)
        this.lastValue = value
      }
    } else if (this.state === "nulls") {
      if (value === null) {
        this.count += repetitions
      } else if (repetitions > 1) {
        this.flush()
        this.state = "repetition"
        this.count = repetitions
        this.lastValue = value
      } else {
        this.flush()
        this.state = "loneValue"
        this.lastValue = value
      }
    }
  }
Like `appendValue()`, but this method is not overridden by `DeltaEncoder`.