> I just want to understand what is the deep reason for the syntax
> inconsistency between map index and type assert.
a map is fully typed at compile time. even if its key is of type
interface{} the language defines how to compare two interface{} values
using type assertion here:
https://golang.org/ref/spec#Comparison_operators
"Interface values are comparable. Two interface values are equal if
they have identical dynamic types and equal dynamic values or if both
have value nil."
Using interface{} in assignments on the other hand is only type-safe
at runtime when used with a type assertion.
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