These exist in confusables.txt because they map to the same abstract character under NFKC decomposition. The map is semantically correct. But from a visual perspective, these are false positives: a human would never confuse Mathematical Fraktur l with plain l.
if (left < n) {，详情可参考爱思助手下载最新版本
const bytesAvailable = totalBytes - offset;，更多细节参见51吃瓜
The blocks are linked together to create a history.