docs: function(conn, cb) {
        log.debug('teardown:', conn);
        /* istanbul ignore if: standard waterline-adapter code */
        if ( typeof conn == 'function') {
          cb = conn;
          conn = null;
        }
        /* istanbul ignore if: standard waterline-adapter code */
        if (!conn) {
          connections = {};
          return cb();
        }
        /* istanbul ignore if: standard waterline-adapter code */
        if (!connections[conn])
          return cb();
        delete connections[conn];
        cb();
      }