3. Apply per-script thresholds. Cyrillic confusables at 0.447 mean SSIM require aggressive blocking. Mathematical Alphanumeric Symbols at 0.302 can be handled more permissively, especially since NFKC already collapses most of them. Arabic at 0.205 generates almost no genuine visual confusion and can be deprioritised entirely.
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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曾经的骆驼湾村，“九山半水半分田，石头缝里难挣钱”，进村的路，是坑坑洼洼的黄土路。