I had to smirk at the sarcasm (intended or no). I merely included "processes modifying their env" amongst all these historical warts. I consider doing so as inevitably necessary as append writes, the advantages of which you aptly described. That's my opinion, underpinned by the history of those interfaces. I hope we can agree that the breakage is by-and-large in an (old, historical) interface that allows braindead usage, not in either the implementor or the user ?