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These Iterator is fused if the underlying Iterator is fused.
FilterOk
FilterMapOk
InterleaveShortest
KMergeBy
MergeBy
PadUsing
Positions
Product
RcIter
TupleWindows
Unique
UniqueBy
Update
WhileSome
These is fused even though the underlying Iterator is not fused.
Combinations
CombinationsWithReplacement
Powerset
RepeatN
WithPosition
FusedIterator
can be added to these structs.Related #55, #152, #531, #533
I separate the pull request with #548 because these Iterator are sure to be fused because it was documented, but I'm not 100% sure that the structs in this PR is actually fused. (Though I believe it is.)