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In the reducible model as described, it's not possible to implement some operations efficiently, like map on multiple collections (this is called zipWith in Haskell). Also, if you filer/map/etc a function over a reducible and then use the resulting reducible twice, it will cause the filter/map/etc to be performed twice. This can lead to performance surprises, for example it can turn a linear time algorithm into an exponential time algorithm in some cases. Thus this is not a drop-in replacement for seqs, although it can probably cover most uses more efficiently.

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