The problem is, there isn't really an order to preserve in the first place, since even if the original collection is a sequencable one, the elements of each group would be interleaved in it. I could see the point of sorting the keys though.
Hello, I found a useful method in the collection - groupedBy: - the result container is some PlugableDictionary (integer variant) and group order (keys) is not preserved.
Would not it be better to choose some other Dictionary variant, which preserve the order of groups (like in source Collection)?
pf
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