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…字和字符是因为其具备连续步进特性（Step trait）的逻辑；澄清了空是指序列区间为空（如 5..1），而非类型本身是否为空。
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原文中提到“数字和字符是 Rust 中仅有的可以用于判断是否为空的类型”，这在技术上是不准确的（忽略了 Vec、String、Option 等大量可判空类型），容易误导初学者。
修改内容：删除了关于“仅有的判空类型”的表述；明确序列支持数字和字符是因为它们具备离散连续性（Step 特征），能明确步进逻辑；解释了“空”是指区间范围（如 5..1），而非类型本身的属性。