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`Array.from(bytes, f)` had no lowering — only the mapper-less `toArray` — so every mapper over a typed array fenced. It lifts a loop that reads each element through the typed array itself, because Node iterates live: a mapper that writes the source is visible to the indexes it has not visited yet. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>