code: function buildNativeCoClientBuilder(clientBuilder) {
  	return function nativeCoClientBuilder(config) {
  		var connection = clientBuilder(config);
  
  		connection.connectAsync = promissory(connection.connect);
  		connection.queryAsync = promissory(connection.query);
  
  		// for backwards compatibility
  		connection.connectPromise = connection.connectAsync;
  		connection.queryPromise = connection.queryAsync;
  
  		return connection;
  	};
  }
docs: Wrap the `pg` `clientBuilder` function to add co extensions.
  
  Since the exposed `clientBuilder` function from `pg.native` is a simple function that wraps the
  construction of a native client connection, we don't have easy access to the prototype to inherit
  prior to construction of the connection. Instead, we call the `pg` `connectionBuilder` to get an instance
  of the connection and add additional methods directly to the constructed object. The methods are *not*
  added to the `pg` `Connection` prototype however, as that would alter the prototype in `pg`, and would
  increase the `co-pg` footprint beyond constructed objects that have been tunneled through this package.
  
  @param {function} clientBuilder the native client builder from `pg`
  @returns {function} the native client builder with co extensions