polish: use closure instead of CollectFieldsContext #4361
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While working on #4360, I felt myself trying to reach for opportunity to remove the CollectFieldsContext type/object that I previously introduced; this is accomplished in this separate PR.
Benchmarking on my machine, this seems essentially no better and no worse in the performance realm. I am evaluating this in terms of readability, both in the local sense and in the overall algorithmic sense of better understanding the method and limit of how we are recursing.
Overall, I think it's a minor improvement.