+1 for map's zero value. Huge inconsistency in a language.
I think, it were made for speed: map is just a pointer (to hidden struct).
Zero-map is just nil pointer. To make zero-value mutable there should be
assignment to a pointer on every access.
More over, map has reference identity ie it is always copied by reference:
a := b
b[1] = 1
a[1] == 1
This is impossible to implement with mutable zero value.
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