const res = new Array(n);
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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▲提示词：一张繁忙亚洲城市雨夜的电影感街头照片。一个巨大的、发光的红色霓虹灯牌挂在一座老建筑上，上面清晰地写着「重庆老火锅」。在它下面，一个较小的蓝色霓虹灯牌写着「24 小时营业 – 欢迎光临」。湿漉漉的柏油路反射着霓虹灯光。
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Update Impracticality: The extensive pre-processing for CH makes it unsuitable for frequent updates, let alone OsmAnd’s goal of supporting near real-time changes through hourly map updates.