The `struct` in map value is overwritten completely

[ben181231]

As mentioned in the title, the struct in map value is overwritten completely. I don't whether it is expected behaviour from the implementor's perspective. But the behaviour surprises me.

See. https://go.dev/play/p/99fVHhz2_L5

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[darccio]

@ben181231 Sorry, that is actually the expected behaviour.