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Update to new stdlib apis. The new Float64 is uniform, which resolves a long comment. https://cs.opensource.google/go/go/+/refs/tags/go1.24.2:src/math/rand/v2/rand.go;l=209 > // There are exactly 1<<53 float64s in [0,1). Use Intn(1<<53) / (1<<53). return float64(r.Uint64()<<11>>11) / (1 << 53) ``` goos: linux goarch: amd64 pkg: go.opentelemetry.io/otel/sdk/trace cpu: 12th Gen Intel(R) Core(TM) i7-1260P │ old.txt │ new.txt │ │ sec/op │ sec/op vs base │ TraceStart/with_a_simple_span-16 387.1n ± 5% 306.8n ± 15% -20.73% (p=0.000 n=10) TraceStart/with_several_links-16 542.2n ± 5% 501.0n ± 2% -7.61% (p=0.000 n=10) TraceStart/with_attributes-16 521.4n ± 14% 571.6n ± 6% +9.64% (p=0.009 n=10) geomean 478.3n 444.6n -7.05% │ old.txt │ new.txt │ │ B/op │ B/op vs base │ TraceStart/with_a_simple_span-16 528.0 ± 0% 528.0 ± 0% ~ (p=1.000 n=10) ¹ TraceStart/with_several_links-16 704.0 ± 0% 704.0 ± 0% ~ (p=1.000 n=10) ¹ TraceStart/with_attributes-16 784.0 ± 0% 784.0 ± 0% ~ (p=1.000 n=10) ¹ geomean 663.0 663.0 +0.00% ¹ all samples are equal │ old.txt │ new.txt │ │ allocs/op │ allocs/op vs base │ TraceStart/with_a_simple_span-16 2.000 ± 0% 2.000 ± 0% ~ (p=1.000 n=10) ¹ TraceStart/with_several_links-16 3.000 ± 0% 3.000 ± 0% ~ (p=1.000 n=10) ¹ TraceStart/with_attributes-16 4.000 ± 0% 4.000 ± 0% ~ (p=1.000 n=10) ¹ geomean 2.884 2.884 +0.00% ¹ all samples are equal ``` --------- Co-authored-by: Robert Pająk <pellared@hotmail.com> Co-authored-by: Damien Mathieu <42@dmathieu.com>