That was the gap. confusable-vision is the tool I built to close it: render every confusable pair, measure the pixels, and put a number on what “visually confusable” actually means.
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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ВСУ запустили «Фламинго» вглубь России. В Москве заявили, что это британские ракеты с украинскими шильдиками16:45，详情可参考同城约会
▲提示词：万米深潜。画面构想：这是一场向海洋极深处的坠落。最上方是波光粼粼的海面和一艘小船；往下是游动着巨大蓝鲸；继续往下光线急剧变暗，出现沉船和发光水母；到了画面的最底部，是一个几乎占据整个屏幕宽度的、潜伏在海沟里的不可名状的克苏鲁巨兽张开的深渊巨口，而上方正有一个极小的潜水员在缓缓下落。