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DjunaCroon I think there shoud (as in other fields) be a qualitative, open-form, narrative list of contributions at the end of papers ("X designed the study, Y wrote the code, etc..."). That way it's totally transparent who did what, so long as everyone agrees on what is written there.
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DjunaCroon And then I would go with alphabetical. To avoid conclusions being drawn from something which is at the end of the day just a list of names.