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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
External annotations via stubs have been a thing for a while. In implementation terms, I believe how it works is the checker framework folks maintain a local fork of the entire jdk to get stdlib annotations spat out ....which is not exactly lightweight, sure, but hey they're already doing it. Actually you end up having to turn off its aggressive collections checking sometimes: https://checkerframework.org/manual/#nullness-collection-arguments
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