Digits in a normal control sequence name are not part of the name. \ray@t1 is parsed as \ray@t followed by the digit 1, not a single control sequence \ray@t1. (You can include digits via \csname ray@t1\endcsname, but \def doesn’t work that way.) Solution: use letters instead of digits (\ray@ta, \ray@tb).
After I finished modifying the code to work in a "Unix-like" "one-shot" fashion, I ran into an issue during testing (that the standard C implementation also shares but manages to hide better) — the numbers it generated stopped being random, but only on macOS. It turns out that it isn't actually specified how rand is implemented under the hood, and the macOS implementation doesn't mix the bits of the seed around very well until you generate at least one random number.，详情可参考WhatsApp Web 網頁版登入
，这一点在手游中也有详细论述
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