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Add ChangeLog entry for Codable adoption of conditional conformances.
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CHANGELOG.md

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@@ -22,6 +22,13 @@ CHANGELOG
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Swift 4.1
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* [SE-0166][] / [SE-0143][]
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The standard library now defines the conformances of `Optional`,
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`Array`, `Dictionary`, and `Set` to `Encodable` and `Decodable` as
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conditional conformances, available only when their type parameters
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conform to `Encodable` or `Decodable`, respectively.
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* [SE-0188][]
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Index types for most standard library collections now conform to `Hashable`.

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