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ebd1fdddaa
calcRandom() 移植的是 C# 里声明为 int 的 32 位比特反转，`<<=` 溢出按二进制 补码环绕，结果恒为合法 signed int32(高位被置起时为负)。Dart 的 int 是 64 位 且被反转值恒正，于是约一半概率产出 [2^31, 2^32) 的正数(如 3212134032)，超出 UserGamePlaylog.playSpecial 的 int 声明，服务器整个 body 反序列化失败返回 HTTP 500，表现为解锁歌曲/获取收藏品不可用。按 C# 位模式重解释为 signed 32 位。 同时补上 userPlaylogList 缺少的 extBool3(UserPlaylog.cs:337 声明的 bool)。
Ichino
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