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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圖像加註文字，麥肯齊必須調解任何工作場所都會發生的員工衝突。麥肯齊在2019年完成首次「冰上」合約後，一步步晉升為站長。他最初在距離「哈利六號」1,000 英里的羅瑟拉研究站（Rothera Research Station）擔任機械維修工程師。