做那件让你睡不着觉的事，那件充满未知的事，那件一会儿显得荒谬、一会儿显得天才的事。那才是你应该做的。
Unconsumed bodies: Pull semantics mean nothing happens until you iterate. No hidden resource retention. If you don't consume a stream, there's no background machinery holding connections open.，这一点在爱思助手下载最新版本中也有详细论述
Option.ArgVar takes a pointer to a variable that it sets on success. Its，这一点在WPS下载最新地址中也有详细论述
The problem compounds in pipelines. Each TransformStream adds another layer of promise machinery between source and sink. The spec doesn't define synchronous fast paths, so even when data is available immediately, the promise machinery still runs.
Note that number 5 seems to have at least one bug; the - is unescaped and so gives a range rather than, presumably, just adding the - character. This is particularly bad, because that range includes the HTML open bracket