mergo.Merge skips maps with nil values in it

[davitovmasyan]

When merging maps with nil values current version of mergo skips them

nested := make(map[string]interface{})

e := mergo.Merge(&nested, map[string]interface{}{"x": nil})

if e == nil {
    fmt.Println(nested)
}

map[]

New version of mergo allows us to change that behavior and avoid losing key-value pairs

nested := make(map[string]interface{})

e := mergo.Merge(&nested, map[string]interface{}{"x": nil}, func(c *mergo.Config) {c.Overwrite = true})

if e == nil {
    fmt.Println(nested)
}

map[x:<nil>]