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I think other than the disagreement about whether the dictionary constructor arg should be a buffer object, it's good to go.
To restate my position: the need is for an immutable string of bytes, and that's exactly what PyBytes_Type is for. I see no advantage to allowing a buffer object, which will require extra code to check that it is both a buffer object and set to be readonly. I believe the argument for aesthetics does not apply, as the constant dictionary constructor argument is a morally different kind of parameter, comparable to (say) the compression level.
You folks are of course welcome to change it, though. 8^)