想法: 竞技场 / PMR 文档模式 (O(1) 卸载,无分配的销毁)

(a) 全部状态式分配器支持 - 可能不值得

在每个节点中存储分配器，遵守 allocator_traits POCCA/POCMA/select_on_container_copy_construction，在复制/移动时传播。"正确"，但深度侵入性很大，并且它会使 sizeof(basic_json) 增加一个指针/节点（当前联合约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约束约