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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macOS only. Windows and Linux ship different fonts with different glyph tables. Cross-platform scoring would require running on each OS or using freely distributable fonts.
It made me wonder, how damaging would it be for an active business? A few hours of downtime costs real money. For me it costed only time.