[swift-evolution] SE-0187: Introduce Sequence.filterMap(_:)

[Tino Heth]

> This proposal only proposes renaming the “filterNonesAndMap” variant (though that name is misleading, it would be “filterNonesAfterMapping” if anything); the other uses of flatMap will remain unchanged.
… then it should be really right: As I learned in the thread, there is a map step before filter, and another map afterwards - so „filterNonesAfterMappingAndMap“ (that’s why I don’t like the use of the term „filter“ here — if you want an accurate name that contains this verb, it gets quite complicated…)
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