public extension PureYAML.Streaming.Token {
    /// A scanner token's kind, mirroring the internal libyaml-ported scanner's
    /// own token kinds (`yaml_token_type_t`) one for one, under public naming
    /// that does not leak the port's internal type names.
    enum Kind: Equatable, Sendable {
        case streamStart
        case streamEnd
        case documentStart
        case documentEnd
        case blockSequenceStart
        case blockMappingStart
        case blockEnd
        case blockEntry
        case flowSequenceStart
        case flowMappingStart
        case flowSequenceEnd
        case flowMappingEnd
        case flowEntry
        case key
        case value
        case versionDirective(major: Int, minor: Int)
        case tagDirective(handle: String, prefix: String)
        case reservedDirective
        case anchor(name: String)
        case alias(name: String)
        case tag(handle: String, suffix: String)
        case scalar(value: String, style: PureYAML.Streaming.Token.ScalarStyle)
    }
}