1. interface { a;b } is intersection. The "Intersection" between two sets
means things which exist in both sets simultaneously.
2. interface { a|b } is union. "Union" means a set of things which which
exist in set A *or* set B.
Quoting from the spec:
*"the predeclared type *any* is an alias for the empty interface." *
*"interface{} // no specific types"*
*"For an interface with type elements, 𝑆 is the intersection of the
specific types of its type elements."*
Can you see now?
>
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