some commenting updates and removing :clear in run-future in favor of actually having a value in the future that specifies whether to clear callbacks after a run (preserve-callbacks, defaults to nil).
some commenting updates and removing :clear in run-future in favor of actually having a value in the future that specifies whether to clear callbacks after a run (preserve-callbacks, defaults to nil).

orthecreedence/cl-async,Drooids/cl-async,orivej/cl-async