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benchmark/sirun/shimmer-startup/README.md

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Critical-path bench. Every instrumentation wraps its targets through shimmer at load time, so a regression here slows startup across all integrations. Measures the wrap operation itself. Two variants: declared-wrap (shimmer.wrap, which manipulates property descriptors) and declared-wrapfn (shimmer.wrapFunction, a standalone wrap). The wrapped function's shape does not affect the wrap cost, so a single sync target is used.