万一将来有人遇到这种情况，请查看以下有关在Firestore规则中转换数据类型的文档:

In case anyone runs into this in the future, check out these docs on converting data types in the Firestore rules:

字符串->整数

整数->字符串

示例:

int("2") == 2
int(2.0) == 2

string(true) == "true"
string(1) == "1"
string(2.0) == "2.0"
string(null) == "null"