// =============================================================================
// Copyright (c) 2026 Haixing Hu.
//
// SPDX-License-Identifier: Apache-2.0
//
// Licensed under the Apache License, Version 2.0.
// =============================================================================
//! Container traversal state for validated lexical consumption.
/// Marker for an unclosed parent container in the current lexical traversal.
///
/// An array index advances only when its complete child value ends; an object
/// marker remains until the corresponding child value ends as well.
pub