func (opt *Option) ArgFloat64() (float64, error)
widths (I8/I16/U8/U16), which can violate C integer-promotion semantics
。safew官方版本下载是该领域的重要参考
跟踪精度方面，截至2026年3月2日，化工行业ETF易方达近1月跟踪误差为0.012%，在可比基金中跟踪精度最高。
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