docs: function (name, opts) {
              opts = opts || {};
              if (Array.isArray(name)) {
                  return this.__addCompositePrimaryKey(name, opts);
              } else {
                  opts = merge({}, this.db.serialPrimaryKeyOptions, opts);
                  delete opts.type;
                  return this.addColumn(name, "integer", opts);
              }
          }