I think if += would always have to make a copy, I would have opted to not support it for lists at all and just say .extend(), which does work in that tuple case.
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截至2026年3月3日,汇添富中证油气资源ETF发起式联接C(023145)近今年以来最大回撤3.78%,相对基准回撤6.90%,在同类基金中排名1/4,基金回撤风险较小。