feat: add generation property to ReadFile for compare-and-swap write support - #481
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Adds an opaque generation token to ReadFile that sinks can populate when reading a file. Callers can pass this token back to sink.write() via options.ifGenerationMatch to perform a compare-and-swap write that fails if another writer has modified the file since it was read.
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# [5.2.0](v5.1.34...v5.2.0) (2026-08-19) ### Features * add generation property to ReadFile for CAS write support ([#481](#481)) ([416744d](416744d))
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Adds an opaque
generationproperty toReadFile. Sinks populate it when reading a file (e.g. from thex-goog-generationGCS response header or an internal counter). Callers can pass it back tosink.write()asoptions.ifGenerationMatchto perform a compare-and-swap write that fails if another writer has modified the file since it was read.