Push Ifs Up and Fors Down: The Rewrite That Loses at 50/50 Data

The beloved refactor (hoist the branch to the caller, batch the loop) just got a category-theory proof and a Rust benchmark in the same month. The proof says it's legal; the benchmark says it loses at 50/50 data, and the disassembly explains why.

$ 2026.10.13 · 5 min read · #refactoring

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Push Ifs Up and Fors Down: The Rewrite That Loses at 50/50 Data

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