code: function LLUOptions(options) {
    this.createIfMissing = true;
    this.errorIfExists = false;
    this.compression = true;
    this.cacheSize = 8 << 20;
    this.writeBufferSize = 4 << 20;
    this.maxOpenFiles = 64;
    this.maxFileSize = 2 << 20;
    this.paranoidChecks = false;
    this.memory = false;
    this.sync = false;
    this.mapSize = 256 * (1024 << 20);
    this.writeMap = false;
    this.noSubdir = true;
    this.bufferKeys = true;
  
    if (options)
      this.fromOptions(options);
  }
docs: LowlevelUp Options
  @constructor
  @ignore
  @param {Object} options