After updating to Xcode 15 beta 7, I got a VersionedSchema error saying that

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does not conform to protocol 'VersionedSchema'

Previously, the variable versionIdentifier was of the type String.

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static var versionIdentifier: String = "v1"

On the latest Xcode 15 beta 7, versionIdentifier is now of the type Schema.Version.

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static var versionIdentifier: Schema.Version = Schema.Version(1, 0, 0)