> I suggest differentiating between enum vs. tag union types syntactically.
Even though enums are a special case of tagged unions, my motivation for
differentiation is that enums are guaranteed to have efficient
implementation whereas unions may or may not be.
It should be easy enough to implement that special case efficiently (and
document the fact that it's efficient so users can depend on it). That
seems cleaner to me than saying that `enum {A,B}` is semantically identical
to `union {A,B}` but might be implemented differently.
- Sean
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