Most userland implementations of custom ReadableStream instances do not typically bother with all the ceremony required to correctly implement both default and BYOB read support in a single stream – and for good reason. It's difficult to get right and most of the time consuming code is typically going to fallback on the default read path. The example below shows what a "correct" implementation would need to do. It's big, complex, and error prone, and not a level of complexity that the typical developer really wants to have to deal with:
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（三）非法进行影响国（边）界线走向的活动或者修建有碍国（边）境管理的设施的。，详情可参考heLLoword翻译官方下载
Игорь Дмитров (Редактор отдела «Россия»)