Protocols
The following protocols are available globally.
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                  A protocol that represents a key used for indexing in a database. Types conforming to this protocol must be both HashableandCodable, ensuring that they can be used as unique keys in collections like dictionaries and can be serialized/deserialized for persistence or transmission.DeclarationSwift public protocol IndexKey : Decodable, Encodable, Hashable
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        Protocols  Reference