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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UMAP: 2-10x faster than Rust’s fast-umap, 9-30x faster than Python’s umap
For the last five years I have been working on Towerborne, an action RPG brawler developed by Stoic Studio and published by Xbox Game Studios. Towerborne launched on Steam in early access on September 10th, 2024 and then on Xbox in game preview on April 29th, 2025. On February 26th, 2026, Towerborne had its full 1.0 release on Steam, Xbox, and PS5.