In RSpec, raise_error and raise_exception are aliases. Since "error" is a more general term, it's reasonable that it matches "kinds of" exceptions. Here, raise_exception is used to match only a specific kind of exception. Any confusion that results will be short-lived as MSpec 2.0 will use a different syntax.
MRI 2.0 treats Floats as immediates if double-tagging is used.
…ve got certain things in your hosts file
I don't think it belongs in mspec scripts; we may want to avoid it entirely.