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perf: spindel 0.1.102 and cheaper seeded streams (~2x SMC) - #47
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whilo
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Per-site stream seeding was ~21% of SMC CPU. canonical walks only collections (no postwalk on scalars), the UUID's words come from its bits instead of hex parsing (JVM), and next-u32! no longer recomputes the step it just applied. Generator states are bit-identical: a new test checks words and 100 draws against the previous computation for scalar, vector, map, list, set and map-entry seeds. ~1.05× on the SMC benchmark on top of spindel #108; identical log-marginals.