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V8 currently has a performance defect involving object spread operations that can cause degradation in runtime performance. By specifically not supporting the object spread language feature when using the esbuild-based browser application builder, a downlevel form will be used instead which provides a workaround for the performance issue. The downlevel form can cause up to a 600 byte increase in file size if an object spread operation would otherwise be present in an output file. For more details: https://bugs.chromium.org/p/v8/issues/detail?id=11536