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:
第三十五条 居民委员会不及时公布应当公布的事项或者公布的事项不真实的，居民有权向不设区的市、市辖区的人民政府及其有关主管部门或者街道办事处反映，不设区的市、市辖区的人民政府及其有关主管部门或者街道办事处应当负责调查核实，责令依法公布；经查证确有违法行为的，有关人员应当依法承担责任。
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（图源：长春高新 2021 年年度报告）
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