Can anybody point me to some good documentation (either online or
dead-tree) of the IRB module? The RDoc is pretty bare-bones, and the
samples I've found online aren't terribly well-commented or
self-explanatory.

As background: I'm trying to hook up the text-rendering of my OpenGL
engine to act as a Ruby console. I've got it interpreting individual
lines with eval(), but I'd like to set it up with IRB proper to make use
of the history, prompting, output, etc.
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