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FilePath becomes a wrapper over two backings behind one unchanged public API: - Backings: _SwiftSystemFilePath (classic, default) and _StdlibFilePath (SE-0529) - Switch at runtime: _setFilePathSemanticMode(.legacy / .stdlibNew), or the _SWIFT_SYSTEM_NEW_FILEPATH env var - Per-backing dispatch for Root, ComponentView, and Component, so each era's own validator answers; all era logic lives in the wrapper - Codable _v2 archive-compat preserved - SE-0529 core gated at SwiftStdlib 9999, mapped to macOS 26 (26 floor) - Adds the SE-0529 standalone suite (StdlibFilePathTests) Legacy mode passes swift-system's suite unchanged; SE-0529 mode produces the known semantic delta. Darwin-only.
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For testing purposes, dynamically switch between "old" and "new" file path based on SPI or environment variable. This includes all the semantic changes such as significant-trailing-slash, proper Darwin
Rootparsing, canonicalization of interior.s, etc.FilePath becomes a wrapper over two backings behind one unchanged public API:
Legacy mode passes swift-system's suite unchanged; SE-0529 mode produces the known semantic delta. Darwin-only.