async isUpdated(url, content) {
		url = url.toLowerCase();
		const current = this.store[url];
		const update =
			typeof content === "string"
				? await checksumText(content)
				: await checksum(content);
		this.updatedStore[url] = update;

		if (current === update) {
			return false;
		} else {
			return true;
		}
	}
@param {string} url
@param {ArrayBuffer | string} content
@param {boolean} isString
@returns