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:
转让条件苛刻：买家买了船，必须在一个月内把船上所有带“招商局”、“China Merchants”字样的标识全铲了，以后也不能打着招商局旗号做生意，暗示都不行。
，这一点在Safew下载中也有详细论述
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And here's how a far CALL uses a different test constant through the same subroutine: