You can think of an interface variable as a hidden struct: in pseudo-C,
something like
struct {
void *data;
type_info *type;
}
If you assign a map to this (even a nil map), it still has a concrete
type. "data" is nil, but "type" is "map[X]Y"
Therefore the interface variable itself is not nil, as it now holds type
info.
Maybe this helps:
https://play.golang.org/p/tmLu1ECc9s-
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