In the description of context.WithValue(), we have:
The provided key must be comparable and should not be of type string
or any other built-in type to avoid collisions between packages using
context. Users of WithValue should define their own types for keys. To
avoid allocating when assigning to an interface{}, context keys often
have concrete type struct{}.
I am wondering if someone can explain what exactly comparable means here?
In other languages and Go
(https://golang.org/ref/spec#Comparison_operators), comparable usually
means being able to compare two values for equality/greater/lesser.
Thanks,
Amit.
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