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That's not the RnRS convention; cf. "abelian group".
> make-for-each-generator: obj may be any kind of "collection" but AFAICT
> that term doesn't have a precise meaning here.
No, it doesn't.
> gmerge, gunion, gintersection: The description talks about order but is
> unclear on whether it means increasing or decreasing order. How about
> saying "elements in strict increasing order according to a SRFI 114
> comparator". The "strict" qualifier implies there are no duplicates in the
Increasing order, yes. I see no reason to forbid duplicates particularly.