How to (ab)use TWRequest to create a NSURL with parameters easily

NSURLWithParameters.m

{
	NSURL *baseURL = [NSURL URLWithString:@"http://duckduckgo.com/"];
	NSDictionary *parameters = @{ @"q" : @"TWRequest -site:apple.com" };
	
	// With TWRequest: 1 line with **correct percent escaping**
	NSURL *urlA = [[[[TWRequest alloc] initWithURL:baseURL parameters:parameters requestMethod:TWRequestMethodGET] signedURLRequest] URL];
	
	// Without TWRequest: 10 lines with wrong percent escaping (http://www.openradar.me/6546984)
	NSMutableString *query = [NSMutableString string];
	for (NSString *key in parameters)
	{
		if ([query length] > 0)
			[query appendString:@"&"];
		NSString *escapedKey = [key stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
		NSString *escapedValue = [[parameters objectForKey:key] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
		[query appendFormat:@"%@=%@", escapedKey, escapedValue];
	}
	NSURL *urlB = [NSURL URLWithString:[NSString stringWithFormat:@"%@?%@", [baseURL absoluteString], query]];
	
	NSLog(@"urlA = %@", urlA);
	NSLog(@"urlB = %@", urlB);
}