func (opt *Option) ArgTextVar(val encoding.TextUnmarshaler) error
cleaner implementation that goes with it, POSIX and GNU-style options
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第二百三十七条 本章第二节规定的船舶装载的非持久性燃油以及除第二节规定的船舶之外的其他船舶装载的燃油造成的油污损害责任适用本节规定。