Right, but all the built-in things that deal with environments usually wrap them in a var. There's no special "environment data type", it's just an ordinary dictionary that is wrapped in a var and treated like an environment[1]. So you could pass in your own custom dictionary to eval, for instance. At least, that's the plan.
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* [1]: Actually, I was thinking that it might be a good idea to have a special environment data type, which is exactly like a normal dictionary except that if you try to set a key that isn't a symbol, it throws an error. Not sure about that yet.
