Skip redundant UTF-8 validation for numbers

[Tpt]

No description provided.

[codspeed-hq]

Merging this PR will improve performance by 13.47%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 1 improved benchmark
✅ 3 untouched benchmarks

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	canada	39.8 ms	35.1 ms	+13.47%

Tip

Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing number-valid (448063f) with main (d83a063)}