Continuing the trend of lots of cool things in flight at once, we have an early pitch for native Predicates in Swift: https://forums.swift.org/t/pitch-swift-predicates/62000
There are a lot of short-term design choices I regret where we design something narrow specific in the short term and say "we'll generalize it later", but that generalization never happens or ultimately fails because the specific features got Hyrum's law-ed and have too many quirks to supersede. So I'm pleasantly surprised by how many special case #things we've managed to subsume by macros (in addition to macros enabling cool new things like the Predicate library): https://github.com/DougGregor/swift-evolution/blob/expression-macros/proposals/nnnn-expression-macros.md#macros-in-the-standard-library
