Either expand to an IfExpr to special-case the non-numbers or use number() to force explicit conversions and obtain NaN as under 1.0.
或者扩展IfExpr引入非数字的特殊情况，或者像 1.0 那样使用number()强制显式转换得到NaN。
Generics are useful because they provide stronger compile-time type checking, require fewer explicit conversions between data types, and reduce the need for boxing operations and run-time type checks.
泛型相当有用，因为他们提供强制的编译时类型检查，要求更少的数据类型之间的显式转换，并减少装箱拆箱的操作和运行时类型检查。
Explicit conversion is required by some compilers to support narrowing conversions.
有些编译器需要显式转换来支持收缩转换。
An explicit constructor cannot take part in implicit conversions.
显式构造函数不能参与隐式转换。
Because conversions have to be unique, you either have to make a cast or to make one of the conversions explicit.
因为转换必须是唯一的，因此必须进行一次强制转换，或者使其中一个转换成为显式转换。
An explicit constructor cannot take part in implicit conversions. It can only be used to explicitly construct an object. For example, with the class declared above.
外部的构造器不能参与部分的隐式转换，只能明确的构造一个对象，例如，用上面的例子。
An explicit constructor cannot take part in implicit conversions. It can only be used to explicitly construct an object. For example, with the class declared above.
外部的构造器不能参与部分的隐式转换，只能明确的构造一个对象，例如，用上面的例子。
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