在项目初期，他几乎买遍了市面上的竞品，最后得出一个反共识的结论：理想的阅读器，不该试图让用户「多带一台设备」，而应该寄生在那个我们须臾不离的手机上。
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，这一点在同城约会中也有详细论述
“Many believe that data must be stored within the EU to be protected. But under GDPR it does not matter where the server is located – as long as the country meets the EU’s requirements. If it does not, data may not be sent there”.
Equivalent to IsAssignable[T, Literal[True]] and not IsAssignable[T, Never].This is useful for invoking “helper aliases” that return a boolean
GetDefault here is borrowed from our FastAPI-like example above.