How to use the token-types.Float64_BE function in token-types

private async readFloat(e: IHeader) {
    switch (e.len) {
      case 0:
        return 0.0;
      case 4:
        return this.tokenizer.readNumber(Token.Float32_BE);
      case 8:
        return this.tokenizer.readNumber(Token.Float64_BE);
      case 10:
        return this.tokenizer.readNumber(Token.Float64_BE);
      default:
        throw new Error(`Invalid IEEE-754 float length: ${e.len}`);
    }
  }

private async readFloat(e: IHeader) {
    switch (e.len) {
      case 0:
        return 0.0;
      case 4:
        return this.tokenizer.readNumber(Token.Float32_BE);
      case 8:
        return this.tokenizer.readNumber(Token.Float64_BE);
      case 10:
        return this.tokenizer.readNumber(Token.Float64_BE);
      default:
        throw new Error(`Invalid IEEE-754 float length: ${e.len}`);
    }
  }