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Guarantee partition predicate evaluation #346
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One of the [design goals](https://github.com/fsharp/fslang-design/blob/master/FSharp-4.0/ListSeqArrayAdditions.md#regular-functional-operators-producing-two-or-more-output-collections) of the `partition` functions that the predicate is evaluated only once (not twice) per item. This should be documented guarantee so that developers can take advantage of it.
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One of the design goals of the
partitionfunctions that the predicate is evaluated only once (not twice) per item. This should be documented guarantee so that developers can take advantage of it.A similar guarantee should be added for
Array.partition.