async function crawlCollectionPage <T> (argUrl: string, handler: HandlerFunction<T>, cleaner?: CleanerFunction) {
let url = argUrl
logger.info('Crawling ActivityPub data on %s.', url)
async function crawlCollectionPage <T> (argUrl: string, handler: HandlerFunction<T>, cleaner?: CleanerFunction) {
let url = argUrl
logger.info('Crawling ActivityPub data on %s.', url)