BC mode impacts numeric comparisons in two ways: allowing selection of the first member of a set and obtaining NaN for a non-numeric value, rather than throwing a type error.
BC模式对数字比较的影响有两个方面：允许选择集合的第一个成员，对于非数字值返回NaN而不是抛出类型错误。
Explicit numeric conversion is used to convert any numeric type to any other numeric type, for which there is no implicit conversion, by using a cast expression.
显式数值转换用于通过显式转换表达式，将任何数字类型转换为任何其他数字类型。对于它不存在隐式转换。
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