public extension PureYAML.Tagged {
    /// The presentation style a collection had in the source document, or the
    /// style a caller wants a collection to take on output. `nil` on a node
    /// means "no per-node preference": the emitter's document-wide policy
    /// decides.
    enum CollectionStyle: String, Equatable, Sendable, CustomStringConvertible {
        case block
        case flow

        public var description: String {
            rawValue
        }
    }
}

extension PureYAML.Tagged.CollectionStyle {
    init(_ style: PureYAML.Parsing.CollectionStyle) {
        self = switch style {
        case .block: .block
        case .flow: .flow
        }
    }
}