public extension PureYAML.Model {
    /// A 1-based line/column position in the source text. Carried by ``LocatedValue`` so a
    /// consumer (an editor, a linter, a CI report) can point at exactly where a value-tree
    /// node was written. Positions live on the parallel located tree, never on ``Value``,
    /// so the plain value tree and its equality stay free of source coordinates.
    struct SourcePosition: Equatable, Hashable, Sendable, Comparable {
        public var line: Int
        public var column: Int

        public init(line: Int, column: Int) {
            self.line = line
            self.column = column
        }

        public static func < (lhs: Self, rhs: Self) -> Bool {
            (lhs.line, lhs.column) < (rhs.line, rhs.column)
        }
    }
}