skipRawValues(num) {
    if (this.type === "utf8") {
      for (let i = 0; i < num; i++) this.skip(this.readUint53())
    } else {
      while (num > 0 && this.offset < this.buf.byteLength) {
        if ((this.buf[this.offset] & 0x80) === 0) num--
        this.offset++
      }
      if (num > 0) throw new RangeError("cannot skip beyond end of buffer")
    }
  }
Private method, do not call from outside the class.
Skips over `num` values of the datatype configured on construction.