[issue24879] Pydoc to list data descriptors in _fields order if it exists

[R. David Murray]

R. David Murray added the comment:

No, protocols and duck typing do not always use dunder names.  In fact checking for dunder names explicitly is probably the less common of the two cases.  (We are talking about "protocol" here in a generic sense, not the restricted set of those that include dunder methods.)

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nosy: +r.david.murray

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