DECSTBM doesn’t work because of our unicode half-block shenanigans. We’re squeezing two pixels into each terminal character, and so we want to be able to “scroll” in half-pixels; our scroll needs to turn lower half blocks into upper half blocks when we’re moving vertically. That operation just doesn’t exist.
More posts 26 Feb 2026 8 min read
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If you'd like to do GRPO, it works in Unsloth if you disable fast vLLM inference and use Unsloth inference instead. Follow our Vision RL notebook examples.
Grammar specification of the extensions to the type language