code: function MemDB(location) {
    if (!(this instanceof MemDB))
      return new MemDB(location);
  
    this.location = location || 'memory';
    this.options = {};
    this.tree = new RBT(cmp, true);
  }
docs: In memory database for wmcc_core
  using a red-black tree backend.
  @alias module:db.MemDB
  @constructor
  @param {String?} location - Phony location.
  @param {Object?} options
  @param {Function} options.compare - Comparator.