decode(_:context:file:line:)

@preconcurrency func decode<each Column>(_ columnType: (repeat each Column).Type, context: PostgresDecodingContext<some PostgresJSONDecoder>, file: String = #fileID, line: Int = #line) -> AsyncThrowingMapSequence<Self, (repeat each Column)> where repeat each Column : PostgresDecodable, repeat each Column : Sendable