Another difficulty I just thought of:
- a NT class- and a dcls, for that matter- could also be an iterable
two-tuples that would currently get dict-ified using iteration. So a
precedence rule- does iter() win? Or the asdict functions?- would be needed
for this, too.
The answer to that seems a lot less obvious to me (compared to the mapping
protocol), since iterating k-v pairs is relying on a bit of a side effect,
but that side effect has probably existed since the dict was created.
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