Er, to be clear, this just seems to be an interpreter -- not a meta circular interpreter. I don't see any evidence that it is able to evaluate its own definitions or its own API. It doesn't have any tools to handle class definitions, object instantiation, or method invocation, so I'm not sure by what definition of "meta circular" this interpreter fits.

Not trying to knock the project. Very cool code! Just don't understand how it qualifies as a "meta circular".