List Representation Discrepancy in M's Object Model

Question

Fibonacci[1,1,2]

and

Fibonacci { Head => 1, Tail => { Head => 1, Tail => { Head => 2, Tail => {} } } }

have different representations in the MGraph Object Model.

You can verify that by comparing the "List Example" and "Another List Example" graphs @ http://sixpairs.com/mgom.aspx

The first one has brands while the second one doesn't.

The second one looks more natural to me as the last tail is an empty collection without a brand (and the intermediate tails don't have brands either).

What do you think? Should the two representations be the same or do their differences add more semantic value?

Answer 1

I agree that the second form should be what the first form yields. What it does instead looks like a bug.