Implement compile-time arithmetic and counters using tuple-length tricks for add, subtract, compare, and bounded ranges, with awareness of practical depth limits.
## CONTEXT TypeScript's type system is Turing-complete, and a recurring need is type-level arithmetic: incrementing a counter during recursion, comparing lengths, or constraining a number within a range. In 2026 this is done with tuple-length tricks (a tuple of length N represents N), since TS has no native…
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