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こっちのPRが何か関係してますか??ここら辺のコメントから何かしてそうだなあと思いまして // Universally available type doesn't have any availability conditions // so it could be serialized into "unique" slot to safe space. // Check whether there are any conditionally available substitutions. // If there are, it means that "unique" we just read is a universally // available substitution. https://github.com/apple/swift/pull/42167 (edited)