AFAIK, this bit of arcana was solely the purview of janitors, since the only place I recall it being discussed was the editors wiki, 'way back when it was g0n's "secret node stash". Or IOW, unless you were a janitor (or other cabal), you would not have found it.

Note that neither tribal knowledge nor leprechauns should be derided as potential sources of esoteric knowledge, especially as regards PM.