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In this answer I’ve read about ppp.rb. It is mentioned as “well-known”, but can’t find anything about it on Google.
I found it interesting and I’ve adapted it to build my own version of caller_binding.
But, for my knowledge, what is ppp.rb? What does “ppp” stand for? Where do I find info about it?
A search of Japanese sites via Google Translate reveals many blog posts and conversations about it. Apparently the author’s page is here:
http://www.rubyist.net/~rubikitch/computer/ppp/
It appears to have been written in 2006, and not updated since. Most of the conversations are in the 2006-7 time frame.
So I’d say the OP’s definition of “well-known” may be limited to Japan circa 2006-2007 🙂