The minor thing I decided not to correct, but just changed that decision: it's not quite
in reply to Re^2: regarding 1.02 (was Re: IO::Lambda: call for participation)
in thread IO::Lambda: call for participation
This sets up one of many parallel closures that process in parallel.
This sets up a new lambda object with attached one of many closures that process sequentially.
Per one lambda, only one writable will ever be executed; after it in turn registers readable, socket won't be listened for on_write events. Same is valid for readable.