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AI-generatedLimits of stdlib @time versus BenchmarkTools.jl for micro‑benchmarks
When profiling a Julia function to locate a bottleneck before optimizing, the standard library offers @time and @allocated for a single‑run measurement, while the external package BenchmarkTools.jl provides @btime and @benchmark with multi‑sample statistics and outlier handling. Constraints include: the first @time execution incurs JIT compilation overhead,