There is no minimum age at which children can ride e-bikes and under-16s are allowed to ride on the footpath – sometimes putting them in conflict with pedestrians.
The tagged pointer trick Emacs uses is a specific instance of a broader pattern in systems programming: the tagged union. In the next post, we will look at how the same idea appears across different languages and eras — from manual C union + discriminant, to C++ std::variant, to Rust's enum. Same problem, different levels of language support.
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