Well, no. Or at least, when I say "a Ruby implementation", I mean it is implemented in Ruby, not callable from Ruby. When I refer to a Python C extension, I re

Well, no. Or at least, when I say "a Ruby implementation", I mean it is implemented in Ruby, not callable from Ruby. When I refer to a Python C extension, I refer to it as a C implementation, even though the express purpose is to be callable from Python. I can call Perl (and Python, and Ruby, and Javascript, and...) scripts from the shell, too. So those are now "Unix shell" as well?