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:
Consider some of the more obscure tests that implementations must pass:
。关于这个话题，safew官方版本下载提供了深入分析
Кроме того, российская сторона выразила крайнее недоумение тем, что правоохранительные органы Финляндии «не воспрепятствовали преступлению, а значит, попустительствовали его совершению».
Nature, Published online: 24 February 2026; doi:10.1038/s41586-026-10298-w