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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Fortunately there’s a relatively easy answer. We don’t need to consider the internal implementation of the iterative solution at all in order to be confident in its correctness. Instead, we first convince ourselves of the correctness of the simpler reference implementation, and then convince ourselves that the two are equivalent.
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