[swift-evolution] Adding a new filter method which returns 2 arrays

[Arman Shanjani]

Hi,

I was wondering if we could add a new filter method to the stdlib, where
instead of returning just one array, it returns a tuple of 2 arrays, one
with items that the closure returned true for and one with items that the
closure returned false for. What do you think?

Thank you,

Arman
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