go泛型前的波浪线是什么

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~T means the set of all types with underlying type T ~T 表示具有基础类型 T 的所有类型的集合

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可以看到，带波浪线和不带波浪线的类型是不一样的

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建议：用波浪线(tilde)

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In Go generics, the ~ tilde token is used in the form ~T to denote the set of types whose underlying type is T. 在 Go 泛型中， ~波形符标记以~T形式使用，表示基础类型为T的类型集。

It was also called "approximation" constraint element in the generics proposal, which explains what it's good for in plain language: 它在泛型提案中也被称为“近似”约束元素，它用简单的语言解释了它的好处：

Listing a single type is useless by itself. For constraint satisfaction, we want to be able to say not just int, but “any type whose underlying type is int”. [...] If a program uses type MyString string, the program can use the < operator with values of type MyString. It should be possible to instantiate [a function] with the type MyString. 列出单一类型本身是没有用的。为了满足约束条件，我们不仅希望能够说 int，还希望能够说“基础类型为 int 的任何类型”。 [...] 如果程序使用type MyString string ，则该程序可以将<运算符与MyString类型的值一起使用。应该可以使用MyString类型实例化[函数]。

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https://stackoverflow.com/questions/70888240/whats-the-meaning-of-the-new-tilde-token-in-go

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https://www.calhoun.io/what-does-the-tilde-mean-in-go-generics/

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golang里写泛型最好带波浪线，不带的话，不支持自定义类型