If the unsigned integer type has rank greater than or equal to the rank of the signed integer type, the common type is the unsigned type.
如果无符号整型的优先级高于或等于有符号类型，公共类型是无符号类型。
If the unsigned integer type has rank greater than or equal to the rank of the signed integer type, the common type is the unsigned type.
如果无符号整型的优先级高于或等于有符号类型，公共类型是无符号类型。
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