Merge with mergo.WithOverride gives unexpected behavior

[mtt0]

package main

import (
	"fmt"
	"github.com/imdario/mergo"
)

type Foo struct {
	A string
	B int64
}

func main() {
	src := Foo{
		A: "one",
		B: 2,
	}
	dest := Foo{
		A: "two",
	}
	mergo.Merge(&dest, src, mergo.WithOverride)
	fmt.Println(dest)
	// Will print
	// {one 2}
	// Expect
	// {two 2}
}

• mergo.Merge(&dest, src, mergo.WithOverride) gives {one 2}
• mergo.Merge(&dest, src) gives {two 2}

https://github.com/imdario/mergo/blob/29fb3d3bdc5512887f1dc9aedde6a0fed407fa8f/merge.go#L313

Go PlayGround

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[darccio]

@mtt0 Why is it unexpected?