[Autoloop] [Autoloop: tsb-perf-evolve]

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🤖 This PR is maintained by Autoloop. Each accepted iteration adds a commit to this branch.

Goal

Evolve Series.sortValues in src/core/series.ts to minimize the fitness ratio tsb_mean_ms / pandas_mean_ms. A value < 1.0 means tsb is faster than pandas on the benchmark (n=100k floats with 5% NaN).

Program issue: #189
Strategy: AlphaEvolve (MAP-Elites population-based evolution)

Current Best Metric

Pending first CI run (sandbox bun not available for local evaluation).

What's in this branch

Iteration 1 — Island 1: Indirect typed-array sort with NaN pre-partition

• Replaces the original boxed {v, i} object-pair sort with an indirect Uint32Array index sort
• Pre-partitions NaN/null/undefined in a single pass — eliminates NaN checks from the comparator hot path
• Dispatches to one of two monomorphic comparators (ascending vs descending) to help JIT specialize
• Single gather loop instead of two .map() calls
• Reduces GC pressure from N object allocations to zero at n=100k

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Commit pushed: a018e16

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Evergreen Fix 🌿

Issue: TypeScript type errors in src/core/series.ts (lines 757–774) — noUncheckedIndexedAccess causes Uint32Array element access to return number | undefined, which can't be assigned to number or used as an index.

Fix: Added non-null assertions (!) to the four nanBuf[i] and finSlice[i] reads in sortValues. The loop bounds (i < nanCount / i < finCount) guarantee these indices are always populated, so the assertions are semantically sound.

Verification: tsc --noEmit exits with code 0 after the fix.

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