Binary Frameworks in Swift
summary
Swift lacks a stable ABI until Swift 5 and that drives concrete problems: Swift array layout changed from 24 to 8 bytes so mismatched compiler builds can read uninitialized memory, every app currently ships the Swift standard library increasing size and memory pressure, and binary frameworks exist but work only with the exact Xcode version (example: ASAP SDK limited to Xcode 9.1). Teams avoid Swift binaries by shipping Objective‑C and bridging with C++ to fill language gaps.
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