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Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

semantic versioning

A version numbering scheme where the number says whether an update can break your code.

In semantic versioning (MAJOR.MINOR.PATCH), a MAJOR bump may break users, MINOR adds features compatibly, PATCH fixes bugs; before 1.0, Cargo treats the MINOR number as breaking.

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